this is "nightline." >> tonight, deadly live stream. an allegedly intoxicated teen records a fatal ride leading to a crash. even more disturbing she keeps her camera rolling. >> please wake up. >> the social media obsession inciting dangerous behavior. >> that sense i can shock the world is a power a lot of people crave. plus face to face. after three years of messaging, two college students meet for the first time. in real life. >> 100% the weirdest way i've ever met someone. >> what digital dating is doing to romance. and royals reflect. princes william and harry opening up, sharing intimate stories of their mother princess diana in a new documentary.

>> any way of dealing with it was by just basically shoving it out, locking it out. >> speaking candidly about her struggles in the public eye. but first, the "nightline" 5.

good evening and thank you for joining us. i'm rebecca jarvis.

it's the disturbing video raising concerns about alarming behavior on the rise. a livestream of of the crash that killed a 14-year-old girl. why a growing number of social media users are sharing unsafe and sometimes criminal activity. here's abc's matt gutman. >> reporter: it took just seconds for this instagram live stream to go from dangerous to deadly. [ screaming ] the driver shockingly live streaming the aftermath. >> my sister is [ bleep ] dying. >> reporter: the video sparking interest and disgust nationwide. >> out of that tragic car crash in california. >> we begin with new details on that wreck involving sisters. >> maybe even more tragic that it was being live streamed by the person who was behind the wheel. >> reporter: police say 18-year-old adelia sanchez live streamed this ride through central california while she was heavily intoxicated. swerving past that black suv, her 14-year-old sister and

another teen in the car with her. but then the ride turns deadly. [ screaming ] police say the 18-year-old sanchez began drifting off route 165. then she overcorrected. the car tumbling. the three girls inside screaming. >> please wake up! >> reporter: shockingly with her sister jacqueline lying lifeless she continues to live stream. >> i [ bleep ] killed my sister. okay? i know i'm going to jail for life. >> it's very disturbing to us because the callous nature of her actions both leading up to this tragedy and in the immediate aftermath. >> reporter: sanchez has been charged with gross vehicular manslaughter while intoxicated and also driving under the influence. she's being held on a $300,000 bail. if it is determined that it was at least a contributing factor to the accident that she was on her phone and she was showing this live, she could be charged with something up to manslaughter. that means serious time behind

bars. >> reporter: the passenger who survived the crash, 14-year-old manuela seja, speaking out about that horrific incident. >> i never thought this would happen. >> reporter: these shocking incidents seemingly on the rise. people live streaming dangerous and sometimes illegal behavior on social media. >> i think as our technology increases we're going to see new innovative ways that people do or commit crimes. and here the technology is live streaming. >> i found somebody i'm going to kill. i'm going to kill this th guy right here. >> reporter: in april a nationwide manhunt for the so-called facebook killer. >> i'm at the point where i snapped. >> reporter: steve stevens believed to be responsible for a random act of cold-blooded murder that he streamed on facebook live. >> how old are you? >> oh, man, i'm -- >> reporter: taking the life of 74-year-old robert godwin sr. >> this man right here was a good man. and i just -- i hate he's gone. you know what i mean? i don't know what i'm going to do.

>> reporter: a 48-hour desperate search ensued, ending in stevens killing himself. >> looks like there's one guy down in the white car. >> reporter: and just three months earlier four 18-year-olds charged with the beating and racial taunting of another teenager with special needs. that video also broadcast on facebook live. >> why you do this? >> reporter: those suspects arrested and now facing hate crimes charges. they've pleaded not guilty. >> when you live stream you literally now have potentially millions of people watching what you're doing. it's attention. >> i think people are weaponizing it to some extent. they're showing shock things to people who don't necessarily expect to see shocking things. that sense that i can shock the world i think is a power that a lot of people crave. it's now easier and easier to do that with live streaming. >> you should have never got in there. >> reporter: more recently five teens filmed and mocked a 39-year-old man as he drowned. >> ha, ha, ha. >> reporter: not a single one of them called 911.

his body was found five days later. many say those watching those horrific acts bear some responsibility also. >> i tell people every day that if they witness something either on the net or in person they need to contact authorities. i would like people to look at these live stream events just like they were at the event. if they see somebody being assaulted you're either going to step in yourself or immediately get law enforcement there to jump in the middle of it. think about live stream in the same sort of view. >> reporter: in chicago authorities say as many as 40 people watched the alleged gang rape of a 15-year-old girl but not a single one of them called the police. >> chicago police superintendent eddie johnson expressing outrage at the lack of action. >> it just disgusts me that people would look at those videos and not pick up the phone

and die 911. >> reporter: adam moulter, the author of "irresistible: the rise of addictive technology and the business of keeping us hooked" says watching online offers a cloak of anonymity. >> when you're watching something like this happening from a computer screen you're probably a long way away from the action. so psychological distance or remoteness is more likely to diminish and dampen helping behavior. >> reporter: as a result of videos like these social media companies are now looking for ways to better monitor the content of their products. facebook says it will soon have about 7,500 employees reviewing questionable content. that's about a third of the company's workforce. >> we need a way for viewers to flag content as inappropriate or unacceptable so we can stop a live stream midway rather than perpetuating it, allowing it to continue for ten minutes past some horrendous act. >> reporter: social media companies may be able to take videos down before they go viral. but they won't be able to put a stop to people themselves posting those videos. >> this really boils down to

discipline, parents having very strict rules about when kids can live stream et cetera. hard to control. i get all that. but that -- this really has to start in the home as far as monitoring or controlling or limiting this behavior. >> i think live streaming is causing a lot of fear, especially among parents, because kids are using live streaming in ways that aren't safe. tech companies that are savvy will recognize that fear and they'll recognize there's a gap in the market to be filled and i think some of them are already doing it quite successfully. >> this is your daughter. >> reporter: verizon's product alerts parents when their teenagers are driving too fast. >> you can tell her to drive more like this was you'll get this. >> reporter: sprint has drive first, which sends calls to voice mail and silences alerts when a driver's going more than 10 miles an hour. >> blocks and responds to texts while you drive. >> reporter: and chevy has developed the teen driver mode that mutes the radio if the front seat drivers aren't wearing their seat belts.

in central california tonight sanchez remains in jail. her sister would have turned 15 on sunday. for "nightline" i'm matt gutman in los angeles. >> our thanks to matt gutman for that report. next, digital dating presses pause. why it took this couple three years to finally meet after swiping right. and later, in a new documentary "diana our mother" princes william and harry share personal memories about their mom. after a dvt blood clot... i sure had a lot on my mind. my 30-year marriage... ...my 3-month old business... plus...what if this happened again? i was given warfarin in the hospital, but wondered, was this the best treatment for me? so i made a point to talk to my doctor. he told me about eliquis. eliquis treats dvt and pe blood clots and reduces the risk of them happening again. not only does eliquis treat dvt and pe blood clots. eliquis also had significantly less major bleeding than the standard treatment.

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dating the rules of the game have completely changed. at least for some. like the tinder couple you're about to meet. our cameras rolling as they come face to face for the first time. here's abc's mara chief schiavocampo. >> reporter: in the age of digital dating it's the ultimate story of boy looking for girl and a love that could last happily ever after? today 15% of americans have tried online dating, but for the great majority is finding love as easy as a swipe? >> it's all about innovating. you know, there are 600 million single people on smartphones. >> reporter: and of those 600 million one 20-something duo may have engineered the greatest love story of all time. it all started three years ago when josh avsec logged in to tinder, swiped right and found michelle arendas. >> everybody has the same exact photo. their fingers were up. they had the kissy face and

they're in the mirror. right? they're taking it themselves. she had pictures of her friends and her adventures and where she traveled. >> reporter: mustering up some courage he sent her a message. >> hey, michelle. >> reporter: and then he waited and waited some more until two months later. >> hey, sorry, my phone died. >> reporter: thus began one of the most unusual courtships in online dating, both coming up with more and more creative excuses for their delay. two months later -- >> hey, sorry, i was in the shower. >> reporter: seven months later? >> hi, i really do apologize for just now getting back to you. i've had a really busy week. >> reporter: ten months later. >> michelle, i don't want you to think i'm rude. mid-terms are coming up and it's just been really hard to keep up with it all. >> presidents day had me swamped recently. you know how it gets. >> sorry i haven't been too quick to respond. i just got over a really serious relationship when i was a sophomore in high school. >> reporter: but it was when josh posted their tinder exchange on twitter their flirtatious banter went viral. with 100,000 people liking it.

>> i had 750 followers at the time, and i expected my fraternity brothers and my family to appreciate it, you know. >> yeah. >> and then in six days i had 20,000 followers. >> reporter: some even saying the couple, who had not yet met, should get married. >> people were already talking about the tinder babies and all this big future. is there a lot of pressure now? >> literally pressure from all over the world. >> are you ready for the moment? >> of course tinder took notice, arranging for the pair to fly to new york to meet for the first time on "good morning america." >> three, two, one! meet! [ cheers and applause ] >> it's so good to finally meet you. >> we just met each other. it was the greatest meeting in the whole world. but in truth you can't know that 5 million people are going to watch you hug her for the first time and not feel weird. >> definitely that is 100% the weirdest way i've ever met someone. >> reporter: tinder even offered to fly them anywhere in the world for their first date.

thinking bold, they chose hawaii. a long way to go for a tinder date. >> people make assumptions about sites like tinder, that they're merely for hooking up and nothing else, that nothing else can really grow and evolve from there. but the truth is it doesn't matter how you come in to something. if you actually find someone that you have a connection and chemistry with, there's no reason that both of you can't want something more. >> reporter: but that's what the famous hookup app says it needs to do to stay ahead of the competition. it needs to be making more top-quality matches. >> we've created over 20 billion connections since we started the app. that's 20 billion connections that have resulted in friendships, marriages, dates. >> reporter: in a survey they conducted tinder says 80% of their users are actually looking for a long-term relationship. dr. jess carbino is tinder's in-house sociologist. she conducted the survey for the site. he we can't independently vouch for their findings. >> online daters are 26% more

likely to have had a serious long-term relationship than their offline counterparts. these myths that we have about modern dating are real hooey. >> tinder right now is probably the easiest way in the world to meet someone new. but now we want to make it the easiest place in the world to actually get to know that person. >> reporter: which is what they hope works out well for michelle and josh. >> so is this an example of what happens on tinder? do people take a while to connect? >> i'm not sure personally of any other experiences maybe that have been as long-lasting as ours when it comes to waiting so long to messaging each other. but i do know that so many people that have met through the app and have really found some great relationships along the way, i just think they've -- >> it's very cool. in my own family my sister and my soon to be brother-in-law they're getting married in november, and they met on tinder. >> reporter: but for those still look for love on tinder, some top tips for tinder triumph. >> you cannot wear a hat. you diminish your likelihood of

being swiped right on by 12%. you're obstructing your eyes. glasses, for example-r going to lead you to be less swiped right on by 15%. and smile. you're signaling to people you're kind and approachable. and you increase your likelihood of being swiped right on by 14%. >> the smarter tinder gets the bigger it gets, the larger audiences, the better we get at suggesting the one or two or three people that we think are perfect for you. >> reporter: tinder started out as a few guys on a couch in a conference room. now it's 200-plus people in a whole building on sunset boulevard. so what will tinder look like in another five years? >> you may be walking down the street and siri or the tinder assistant speaks in your ear and says shawn, there's a girl we think you might be interested in, you're both free tomorrow night, you might want to set up a date. >> reporter: for josh and michelle there's no excuse to wait three years to meet. have you been surprised by the attention this has gotten? >> absolutely surprised. >> yes.

>> like surprised is not even a big enough word. it's been crazy. completely shocked by how many people all over the world and even people in my own life that are reaching out to us and sharing their experiences and where they've seen it and how they heard about us and sharing it with their friends. it's just been so shocking that so many people are so excited about it. >> what are you looking forward to? >> well, i just need my feet in the sand. i need the ocean. and it doesn't matter if we are posted up in a cardboard box in maui. if i am in maui i just know we're going to have so much fun. >> yeah, no matter what it's going to be an amazing time. >> reporter: for "nightline" i'm mara schiavocampo in new york. next, princes william and harry speaking candidly about their mother, princess diana, in a new documentary. where's gary? 'saved money on motorcycle insurance with geico. goin' up the country.

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finally tonight, as we approach the 20th anniversary of princess diana's death, a glimpse inside her world from some of the people who knew her best. her sons opening up, sharing revealing new details about their lives together.

here's abc's eva pilgrim. >> reporter: for the first time prince william and prince harry speaking candidly, publicly about their mother's death in the new documentary "diana: our mother, her life and legacy." >> i think to myself how is it that so many people who never met this woman, my mother, can be crying and showing more emotion than i'm feeling? >> it's like an earthquake's just run through the house. it took me a while for it to sink in. >> people deal with grief in different ways. and my way of dealing with it was by just basically shutting it out, locking it out. >> reporter: in the documentary diana's younger brother charles sharing home movies of a young diana we've never seen before. >> she was always very caring of little people. and i suppose i was the first little person that she kald for. >> reporter: her family opening bup dian up about diana's triumphs and troubles. specifically the infamous relationship with the paparazzi. the documentary krefrnsing a specific incident on a ski

vacation in austria. >> could i ask you to respect my children's space? >> i don't believe being chased by 30 guys on motor bikes who block your path and make a woman cry in public to get the photographs, i don't believe that is appropriate. >> reporter: prince harry also revealing the struggles they faced as children of divorce. >> we were, the two of us were bouncing between the two of them and we probably didn't -- we never saw our mother enough or we never saw our father enough. both men talk about how loved she made them feel. a love they still feel 20 years later. the princes say they still feel their mother's presence with them. william revealing he even felt her at his wedding. >> when it came to the wedding, i did really feel that she was there. you know, there's times when you look to someone or something for strength and i very much felt she was there for me. >> reporter: for "nightline" i'm eva pilgrim in new york. >> with them always. thanks for watching abc news. and as always, we