this is "nightline." >> tonight, for love or likes? >> will you go to prom with me? >> yes. >> the ask seems to have gotten bigger than the prom as kids spend more than ever going to extremes to outdo each other for the biggest promposal. plus turning the tables. a woman confronting her alleged harasser. >> hey, get this guy. stop him. stop this guy. >> i had to get his face. i had to get something on him. >> call the cops. >> reporter: the response on social media, astounding. >> i was 100% sure it was the same guy. >> we explore the ups and downs and taking justice into your own hands. >> and the so-called superball of fashion.

whose fashion scored big tonight. but first the night line five. >> here's what we were thinking. what if you could get a mortgage on your phone? wouldn't people more buy homes, and wouldn't they have to fill their homes with goods, and further stoking demand as the tidalaw wave of ownership flood the country with others who must own other things. anyway, that's what we were thinking. >> number one, in just sixty-seconds.

good evening. thanks for joining us. it's that time of year. american teenagers going through the ultimate high school right of pass taj.

prom. the date is old as the dance itself. now the promposal is rising to dizzying new heights and creativity, costs and increasingly social media pressure. tonight we ask what's the real motivation behind the epic asks? >> reporter: for high schoolers it's the ultimate public display of affection. the promposal. the simple act of asking for a prom date. now the latest social media ritual going to extremes. from sweet serenades to flash mobs. featuring over the top choreography. to famous political faces. >> niko it would be k sick if you would go to the prom with julia. >> reporter: getting millions of views, shares and likes, but this quest for social media fame is leading some teenagers to lay out elaborate amounts of time

and money in an escalating game of one upsmanship. >> i knew i wanted to do something big. other people had done big things but i wanted to top them. >> reporter: in the olden days the best prom moments aftered at the dance. the kiss at the end of the night in "pretty in pink". but now the prom drama starts well before with the ask. and it's not cheap. the average proem posel costs more than $300. once you at the dress, flowers, limb moe and tickets, prom spending can easy top $1,000 or more per couple. one expert thinks it's fuelled by social media. >> it's not a surprise they'd want to get elaborate with their first romantic gesture. that being said, in a world where everyone likes and clicks

on your promposal, it ups the anti. >> the guy is putting the finishing touches on his promposal. tomorrow he'll hand this oversized prom ticket to his girlfriend at the end of her high school performance. >> i'm going to use it to get her to come with me instead of go with the captain that she's been in the play with. >> reporter: he's convinced the pay off on social media will be worth it. >> go big or go home, i guess. >> reporter: the next morning his nerves are starting to show. >> i'm sweating a little. >> reporter: friends and faculty give him a last-minute pep talk. at last, it's time for his pr prompos promposal. he strides to the stage. his girlfriend's jaw dropping response, worth the wait. >> move over, there's a new captain.

mcken in a, i have your ticket and your suitcase packed. will you go to prom with me? >> yes. [ applause ] >> reporter: once a promposal is posted online it gets an instant viral boost when twitter handles and hash tags are around them. a 17-year-old promposal is the kind people love to like on twitter. >> everyone comes up to me the next day at school, thanks a lot. now ours will look not as good. >> reporter: he rented a plane and then flew over a street where he'd written prom in chalk. the object of his affection was thrilled. >> i got 160 likes on insta gam. that was cool that it got that many. >> last year i got her a sign that said i meant to ask you prom, and i had a bunch of peppermints. >> that was homecoming. >> last year for prom you wrote

it on my car. >> right. >> reporter: as extreme promposals become the norm, an author worries it can ad to the pressure of fitting in and or being popular. >> i would want them to do it because they care about them and want it to be meaningful rather than how many likes they're going to get on facebook. >> i have an announcement -- >> reporter: not to mention the pressure to say yes. when this young woman turned down her would be prom date in this youtube video, he was harshhars harshly criticized in the comments. >> if a guy asked the girl and she said no, she's shamed. the other way around, she's not. >> reporter: in an era of girl power, promposal can be sexist. >> it's a subconscious bias that the boy always has to ask the

girl. i think if a girl asked a guy it might warrant a different response from people. >> reporter: he handed you flowers. was your heart pounding? >> sometimes when a boy flips for a girl, literally -- the crowd can't help but cheer. >> that's so cool. >> reporter: your boyfriend is doing back flips for you. there's nothing more romantic. is that you? >> that's me. >> reporter: look at him. oh, that is so cute. >> they're throwing confetti on you. he's so handsome. >> thank you. >> reporter: this senior has been on the hunt for a dress ever since her boyfriend made that tumbling proposal a few years ago. >> reporter: ytoday she's gettig this one for free thanks to operation prom. a nonprofit started 13 years ago to help offset the costs of

prom. >> i think it's out of control. with the expenses senior year to begin with, you're going to college and paying for college applications and then you pay for prom and that's a ticket, a dress, limo, it's gotten out of hand. >> the group gives away racks own dresses worth hundreds of dollars each. >> these came from macy's. >> reporter: these are dresses were girls who can't afford to buy one or their school counselors recommend them. >> i wish it didn't cost so much. i think with social media, the competition of everybody try to do something bigger and better, it's almost impossible to pull back. >> reporter: it's like a prom arms race. so much so that she says her organization may get into the promposal game. >> operation prom would sponsor some of them and the money the students would pay for it would go back to students that were in need. >> reporter: over 2 00 girls

came to the event. including this one who found her dream gown on the first try. how many dresses have you tried on? >> this is the first. >> reporter: you're done. >> her mom, a single mother with six kids, loved it too. >> it feels like hollywood, doesn't it? >> she's going to feel rich. >> reporter: she says the fact that it was free is just the icing on the cake for this aspiring nurse who tells us she was accepted to eight colleges. >> reporter: did they give you good scholarships? >> a full scholarship. >> reporter: a full ride. mom, you did well. back in ohio mcken in a says she was most impressed by how much thought was put into her promposal. some promposals, they spend so much money. something like this, it means a lot more. >> i agree with that. my budget was solid. i like my budget.

>> reporter: how much do you think you spent? >> 30. maybe. >> it was priceless. >> reporter: and before we left, kaple had one more message for promposals. >> i challenge you to top me. do better. i'd love to see it. >> reporter: up next, the woman who chased down her alleged harasser using social media to sound the alarm. >> get this guy. stop this guy. >> reporter: and later, highlights from the super bowl of fashion. how celebrities embraced the futuristic theme. doctor about your medication... this is humira. this is humira helping to relieve my pain and protect my joints from further damage. this is humira helping me go further. humira works for many adults. it targets and helps to block a specific source of inflammation that contributes to ra symptoms. doctors have been prescribing

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imagine a woman bumping into someone she believes harassed her in the past then posting a video of the confrontation on facebook after chasing the man out of a store. viral videos have been a means of harassment in the past, but now perhaps the tables are turning. we have that story. >> reporter: do you remember running into me in the grocery store? caught on camera. this alleged video voyeur on the other side of the lens. >> stop this guy. >> reporter: a florida woman chasing the suspect outside. ? call the cops on him. >> reporter: filming the entire thing. >> that was what was going through my head was just i had to get his face. i had to get something on him to put him out there and catch this guy. >> reporter: she was shopping in the swim suit shopping shen she said this man approached her

asking about a dress for his wife. the questions growing more and more personal. >> i want to make sure it's not too clear. >> right. do you remember running into me in the grocery store? >> reporter: she claims the same man harassed her two years ago inside a supermarket secretly filming their exchange. >> he knew who i was when he turned around. that he was caught. >> reporter: this time she turned the tables by turning her camera on him. >> get him. no. [ bleep ] you. follow this. >> reporter: later posting the video on facebook. >> keep running mother [ bleep ]. >> reporter: that day police charging this man, records showing dispatched after a stalking incident. arrested for reckless driving. it's not the first time he's accused of inappropriate retail behavior. court documents reveals he was arrested for taking photographs of women in the dressing rooms

in 2009. >> this was the second time in two years. i knew that he was doing it to other girls. >> reporter: her facebook warning going viral. now viewed more than 2 million times. echoes of support calling her a hero and brave. other women saying they've been ha ra harassed by the same man. like this woman swho says he harassed her in a target last year. >> i was in the women's clothing section in target, and he walked up to me. the questions progressed from innocent and polite to very personal. >> reporter: that exchange similar to what the other says happened. >> he just kept talking and following and trying to reengage me. >> reporter: she walked away. a year later a bit of justice from this post. >> i think she handled it fabulous. >> reporter: security expert,

joe, warns that the behavior would have put her at risk. >> i think she kind of jumped the gun and got him confused and so he ran away. but this could have turned ugly in the store. >> reporter: we reviewed the video. talk me through what you're seeing. >> here she's running, stop the guy and nobody is moving to help her. >> nobody is rushing to her aid. >> she's running to him. he's not even looking. he's running in the middle of the street. she's running after him. >> reporter: when you're watching, what did she do right? >> at this point she does a good thing by videotaping it and photographing him. you have a picture. my problem is running after this guy. and if you'll notice, as she's screaming for help, nobody is helping. >> reporter: he says the best ways to protect yourself, be aware of your surroundings, and call 9-1-1 or find a security officer if something arises. >> do you remember running into

me in the grocery store? >> reporter: the impressive impulse just the latest in women fighting back against harassment. >> stop that guy. call the cops. >> reporter: psychiatserena wil going after a phone thief last year. watch as she leaps up and chases after him. she quickly catches up and confronts the alleged thief outside. >> once i reached the door i saw she was talking to the guy. >> reporter: she reportedly asked if he mistakenly took the wrong phone. he hesitates and admits he did it because it was so confusing in the restaurant. >> she said she thought that was the best approach to avoid conflict, and i said good job. >> reporter: she later recounted the incident on facebook. just because you're a lady, don't be afraid to step up to any challenge and not be a

victim but a hero. and erin andrews turning the tables in a courtroom with that landmark $55 million settlement. >> i saw it for two seconds and i was like oh my god. >> reporter: winning her battle against a hotel that she says made it easy for him to secretly record a naked video of her. >> i'm so angry. this could have been stopped. >> reporter: now more and more women are fighting back. >> i know you mean it as a climt, but i don't take it as one. >> reporter: in 2014 we met up with lindsey who would like to keep her last name private. she created cards against harassment to combat cat calling. >> women are taught to say i'm not going to say anything because that's how it is.

reason excellent cards to hand out to those who comment on their appearance in public with sayings like -- >> someone simply walking or jogging in your line of sight into an invitation for you to comment on how they look. next time just say hello. >> reporter: tonight the hero of the moment telling us she has no regrets. >> if that's what you have to do to protect yourself, you do what you have to do. >> reporte >> up next, it was all in the details. what taylor swift and others wore.

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dear fellow citizen, time spent with my son really makes me appreciate "the now". but i also have to plan for my family's future. and that means taking on debt. in a smart way. like my mortgage - it's working for me. and if he needs a college loan down the road, that'll be worth it too. it's all about having a strategy, that fits your life. so, if you have a question about how to make debt work for you, ask me. sincerely, brandon heaven fellow dad and fellow citizen.

tonight the night in the city that never sleep, the party keeps people up all night. rachel smith got glammed up to take us inside the met gala. >> reporter: fashion was in full force tonight at the annual met ball. taylor swift rocked a mini dress while claire danes had a gown

and beyonce had a floor length dress. queen b is last to make the entrance on the red carpet. she says this year's gown easier to get into than last year's. and the fashion was all about the details. like this butterfly headpiece. zoe saldana's train. held at new york city's museum of art. it's a fund raising event for the museum's costume event, but unofficially, it's the super bowl of fashion. why is this one of the hottest parties in town? >> it's the biggest fashion event. everybody wants to go and see who is going to be here. >> reporter: the theme of the event, fashion in an age of technology. for many it seemed