ooh ooh ooh ooh thiis "nightline." >> tonight, how social media turned into a gateway to danger for a 13-year-old girl. >> i think that's why she started going to facebook. someone to give her attention and make her feel loved. new details from prosecutors tonight about the killing of virginia middle school student who chatted with her alleged killer on an app used by millions of american kids. plus -- there's star man >> the biggest game of the year for advertisers. on my cell phone >> they're paying a fortune to grab your attention for 30 seconds during the super bowl. >> just wait till you see our caucus. >> the white and gold dress that caused a civil war -- >> the mystery inside the taco box. >> really? >> tonight the strategy behind a $5 million super bowl ad. but first the "nightline 5." >> let's give these dayquil

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seconds. good evening. thank you for joining us. tonight we begin with the shocking crime that landed two virginia tech students behind bars. accused of kidnanaing and murdering a 13-year-old girl. now we're learning new details about how they allegedly planned their horrifying step by step

chilling detachment. abc's eva pilgrim takes us inside the case. >> i never had one of my friends die. >> reporter: she was the sweet virginia middle schooler found murdered. tonight the details of nicole lovell's short life and gruesome death coming into focus along with new concerns about the dangers of social media. >> she seems like she was a nice girl. any understanding of why theyy behalf made fun of her? >> just from her scars. just because it's middle school. >> reporter: nicole faced terrible medical problfms as a child. >> at the age of 10 months old, colie received a liver transplant and fought for her ljfe. >> reporter: the scars were fading, she was older, making connnntions on social media. >> that's w w she started going to facebook. someone to give her attention, make her feel loved. >> reporter: making that awkward transition from childhood to young adulthood and her friend says she was meeting men online.

guy that was over the age of 18. you could tell he was way too old. >> reporter: shortly after, she says, another mysterious janunuyman. january 27t7t, nicole climbed out her bedroom window carrying only her phone and a minion blanket. >> i have had it to right here with people suggesting that this little girl is somehow responsible for all of this. what does she know about flirtation and dating and sex? the girl was lured outolding on, clutching on to her binky, her minion blanket. >> reporter: the police say she snuck away to meet this man and why wouldn't she have trusted him? david eisenhower was a track star, good-looking, successful. >> i realize in the moment that i am doing things that other people wish they could be doing. >> reporter: he'd been on television. >> yet i still have goals for myself because there are people who are better thaha me. and i will personally not stop

>> reporter: nicole never came back. soon almost 1,000 volunteers were searching and authorities scoured for leads until they were able to track the last messages from nicole's phone leading them to eisenhower. >> the investigation led uso 18-year-old david e. eisenhower,, a virginia tech student. >> reporter: with eisenhower in custody authorities soon locate nicole's body, 80 miles away in north carolina. it's about two miles from a home owned by his extended family. >> i'm sure that it's something nicole's family would like to know, why did she have to end up here, left in this condition, discarded in the manner she was? >> reporter: the invesesgation leading authorities to identify and arrest what they say is an accomplice, a friend and another student from virginia tech, natalie keepers, charged with helping eisenhower dippose of the body in these woods. >> i'm assuming that it was probably done after dark and they may have thought they were further away from the road than they actually are. because there's no lighting out here. >>eporter: prosecutors allege

plan the gruesome murder, plotting for weeks, they say scouting locations, and even buying tools. when police showed up to talk to keepers, prosecutors say she immediately tried t t warn eisenhower, texting him "police." it was then she allegedly told fbi investigators eisenhower killed noik ankle and put her body in hislexus, keepers allegedly saying she was excited to be a part of something secretive and special. >> that's really a stunning comment. there is a great deal of callousness about that. she and eisenhower discussed how the murder would be committed, cutting this little girl's throat, as though they're talking about an object. >> reporter: retired fbi profiler dr. mary ellen o'toole saying this is a complicated case with multiplpl motives spelling disaster. >> there's synergy that came together that made this a very lethal pair. >> a very preliminary determination of the cause of death is stabbing. >> reporter: for nicole's

>> her favorite color was blue. nicole was a very loveable person. nicole touched many people throughout her short life. i can't do that part. >eporter: while authorities wait for the results of an autopsy they have concluded that nicole was using a messaging app called kick to communicate with einhower, raising questions about possibly dangerous encounters. >> i'm willing to say kick is a devil for young children. it's like a free ability to text. anything you want. parents can't see the phone numbers that are coming in and out. >> reporter: experts say many of these anonymous apps are popular with teens and predators. >> you can sign up as anybody you want to be. it really becomes a private hunting preserve for some of these dophiles. >> reporter: here's how kik works. download the app for free, add any name and any photo, send

and you don't even need texting service. >> parents sometimes take away these data plans thinking that, well, the child has abused it. but they only need a wi-fi signal to be ageble to communicate. >> reporter: abc reached out to kik who told us kik cooperated with the fbi for their investigation, kik cooperates with law enforcement to combat child predators anywhere in the world, even upon provision of a court order or emergency situations like this one. sorted by geographic location, by school, by age. how do you keep your family safe? >> the firstst thing parents need to do is set ground rules. secondly, know the technology, know how the parental controls work. third, they need to talk to their kids, have ongoing conversations about safety,,o that kid when it comes time makes that safe and smart decision. >> reporter: and it's not just kik. there are many other apps kids can use to hide t tngs from ththr parents.

david wright how easy it is to hide incriminating photos. >> when you open it up and i type in my password and hit the percentage sign it's a hidden photo album. >> reporter: sending photos as easy as point and click. kid swap the files in apps s sh as snapchat, kik, yik yak, whis per, making sharing large numbers of files fast and easy. >> kids will always be savvier than mom and dad, one step ahead of us, that's the nature of the game. >> reporter: nicole's friend carrie said she tried to tell an adult months ago after she notice nicole was communicating with an older man. >> i went to the officer at my school. and wrote down his name on a piece of paper and handed it to him. >> reporter: the blacksburg potice department denying she alerted the officer about eisenhower saying, had a student or even nicole herself reached out to him in advance of her disappearance about anything that could cause concern, he

the appropriate channeledchannels. >> did you make this up? >> no. i think if he would have done something he could have seen the guys on her facebook and he could have stopped all of this. >> reporter: nicole's family filing into court wearing blue ribbons hour before her burial, mourning a daughter gone too soon. >> a preliminary hearing for eisenhower has beenn scheduled for march 28th. next, inside the super bowl of advertising. how madison avenue is rewriting the play bookbooknow americans enjoy the biggest sporting event of the year. counting down to tomorrow night's big gop debate right here on abc and the onehing you can count on seeing.

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i 's the nfl's biggest game of the year but it's also the highest-rated show on television, making the super bowl the perfect marriage of sports and media. this year's expected to generate, get this, $377 million in advertisingrevenue. and whileehe stakes are high for the teams on the field, they may be even higher for the teams and the ad agencies acros america. abc's nick watt takes us inside some of the nation's most creative minds. >> reporter: sunday night there's one battle on the field -- >> caught fothe touchdown! >> reporter: men in tight pants, hard helmets. off the field in commercial breaks there's another just as intense. >> america has seen the light! >> and there's a butt in front of it!

is between women, men in beards and buns, working from industrial space, doodling. "madman" was then. >> this is the greatest advertising opportunity since the invention of cereal. >> reporter: this is now. in this battle deploying every weapon from amusing it girl -- >> it's not too big. like you could handle it. you used to call me on m) cell phone >> reporter: to canadian rappers. >> these changes don't ruin the song at all. >> reporter: recently deceased rock stars. star man >> reporter: athletes. >> you're holding it upside down. >> really? >> reporter: uglgl aliens. and septuagenarian celebrities with socks on their hands. >> there are those who expect more. >> reporter: every slot costs ughly $4.8 million for the air time alone. it's up 75% in just the past 10

because over 110 million will watch sunday night. the highest-rated show on television. >> you're talking about an audience that is larger than any other audience out there. >> reporter: and then the braggingrights. >> i've never been a professional athlete but i know what it's like to be a professional marketer. raising to be on the biggest game of the year. >> reporter: the w w doritos does it, competition, a $1 million prize for the best amateur submissions whichhey air sunday night. here are two of the three finalists. and the dog the stars in this one. >> the schtick is dogs like doritos too? >> exactly, erybody likes doritos. >> competing with huge ads created by mega companies, we don't have all that access, so we've got 30 seconds to make people relate and maim peek laugh and remember it. >> relate, laugh,remember. >> yeah. >> reporter: for the ad-obsessed, youtube o oers

fans can watch and vote on their favorite commercials. >> what is up, guys? >> reporter: videos from social stars like millennial ava gutowski part of the draw. >> it's about the conce. no matter if you're putting a ton of m mey mind it or one little blog camera, people are going to go to whatever they want to watch. >> reporter: the big dogs also leverage social media, leaking teasers, trailers, sometimes the actual commercials, ononne ahead of time. it's n n the norm. >> when it comes to game day, if you've seen this commercial already you're going to say, wait a minute, everybody, stop, put your beers down, check this out. >> reporter: this is the david and goliath agency in l.a. >> doors will open to reveal the new optima -- >> reporter: we'll call them team kia. their walken kia spot is already racking up hits on youtube.

>> the new kia optima. >> reporter: in manhattan, team bud light airing their offering early online. >> so far, so good. on track i would say. >> america has seen the light! >> and there's a butt in front ofof it! >> reporter: now to deutsche in l.a. 2011, they intentionally leaked this gem for volkswagen. and set a trend. >> why put it out there before, why not keep it for the super bowl? >> we thought, if there's that muchhrustirst and hunger for this content, just give it to them, just lean into it. so that blew up huge. then the next year, evybody was doing that. >> reporter: but this year they y are teamaco bell. and taking a different tack. >> the toppings would stay in better if we flipped t. >> it's become standardow for brands to drop their ads early.

sometimes a week, two weeks before, you know, the spot even comes out. but this year taco bell and i think a lot of advertisers thihi year have chosen to hold back. i don't think as many people are showing everybody what they've done before super bowl sunday. >> you're holding it upside down. >> really? >> reporter: there are teasers. james harden really does not know what he'e' advertising. >> taco bell won't talk about the product they're launching until sunday. they won't show the commercial until sunday. everything's a mystery. >> i mean, how top secret can a taco bell product be? >> you can preorder the product, 700 people as of this morning preordered something they don't know what it is. >> that's genius advertising. you're selling something t people they don't know what it is. you don't know wt it is but you already want to eat it. preorder now. >> do you know what it is? >> no idea. >> what can they do to a taco? >> reporter: who wins this and arguably the bigger b btle susuay night? it stands to critics, sales, social media reaction, and the looks on friends' faces. >> tooking around the room

>> yeah, yeah. >> if they're actually -- >> hey, nice, you did pretty good, that's great, brad. >> that's not good. >> not good, that's the fake one. then ere's, "that was good!" that's the one i'm looking for. >> i ie got something for you, girl. knowledge. anywhere you want it. >> reporter: i'm no stranger to the ad game. we made this for "nightline" a year or two ago. long story as to why. anyway. to get an idea howow this multi-million dollar creative process begins, a challenge. >> i'm a very difficult client. we have a tv show called "nightline." you n nd to think of a super bowl commercial for our tv show. ideas, come on. you're all crazy people, throw them out. >> "nightline" is better than any other show? >> wee are better at topical news but funny. >> do you want to tug at the heart strings? >> no, i don't want any schmaltzy stuff.

like smutty bell -- laughs. >> if you guys were the first to create an icon outside -- nontraditional icon, like maybe a talking cat. >> r rorter: stay with me. >> do you haha an enemy? >> james corden. >> seth meyers and james corden. >> so take down seth meyers. >> fall asleep to us instead. >> reporter: is they nowhere ar as inspiring as christopher walken with a sock. here's why. >> as much as we'd probably love to come up with a great super bowl commercial for you for "nightline" right at the table today -- >> it would take eight, ninin months. >> reporter: the goal of every agency is and forever has been to upstage this. the commercial that started all this super bowl commercial battle back in 1984. apple. can anyone trump it this year? >> we shall prevail! >> reporter: schumer perhaps? >> that's why we're forming the bud light party. >> reporter: walken?

>> war hawk, this is good! don't know really what it is! >> reporter: or whatever it is in that taco box. i'm nick watt for "nightline" in los angeles. next, counting down to the battle for the granite state. we'll have a preview of tomorrow night's final republican presidential debate right here at abc before tuesday's decisive new hampshire primary. (music) woman: i'll never remember all the projects, presentations, or meetitis i gave up my nights for. (music's drums intensify) but days like this, i'll never forget. get out there, in the 2016 ford escape. be unstoppable. this is my fight song take back my life song

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for new hampshire and the stakes couldn't be higher in the republican contest. donald trump will be front and center for their final debate moderated by our own david muir and martha raddatz. giving us a sneak peem tonight. >> hey, good evening. the e eitement is mounting here at st. anselm college in manchester, new hampshire, as our abc news crew iputting the finishing touches on our debate stage. top three candidates -- donald trump, ted cruz, marco rubio -- will be taking center stage here tomorrow night and if there's one thing we can count on it's some heated exchanges. all the candidates are gunning fofo momentum. just ahead of the crucial new hampshire primary on tuesday. everybody wants to make their mark, survive this debate, and move forwbrd. but it may be the last chance for s se. >> thank you, martha. martha and david muir will moderate that debate tomorrow night at 8:00 eastern, 7:00 central time, right here on abc. it was former president george

tells you america's best days are behind her, they're looking the wrong way. thank you for watching abc news. tune into "good morning america" tomorrow.. as always we're onlinene on our "nightline" facebook page and abcnews.com. good night, america. have a good weekend. it seems today that all you see is violence in movies and sex on tv but where are those good old-fashioned value on which we used to rely? ucky there's a famililguy lucky there's a man who positively can do all the things that make us laugh and cry