tomorrow a movie called "concussion" premieres in theaters. >> a doctor uncovered the truth about brain damage in football players. what is the nfl saying about it right now? here's ryan smith. >> you're going to war with a corporation that owns a day of the week. >> reporter: the national football league speaking out exclusively to abc news just days before the premiere of "concussion." >> do you want fans to see this movie? if there's a benefit, we're going to elevate the conversation around the health and safety of our game. >> the trailer suggesting back then the league didn't want to face issues concerning head trauma. >> the nfl does not want to talk to you. >> when a movie like this comes this is a sign that the nfl how do we know they're not giving us all the information now. done. >> reporter: the league saying a updates to 39 rules related to health and safety in the last

concussion protocols and investing millions to improve equipment like special straps that aim to regulate head movement in the helmet. is this enough? the doctor telling robin roberts no matter how protective the helmet, it won't stop injuries. >> look what happens to your brain when you have impact. the brain bounces around the skull. you take a padding, the padding will simulate the helmet. no matter how thick it is, look at what happens. >> what difference does improving the equipment make when a head-to-head impact or some very hard impact could traumatize the brain no matter how thick the outer protection layers are? >> you can improve the rules and the safety of the equipment. >> reporter: do you think we can ever stop head injuries in football? >> probably not, but i think we can minimize them to make the game as safe as possible. >> ryan smith, abc news, new york. >> i thought that the interview was incredible with the nfl officials.

about what's happening there in the nfl. from the fomo, the fear of missing out. the proliferation of bling social media and how it's affecting kids that don't have first world problem next on "world news now." continues after this from our

continues after this ftt2w`t2n`qd" bt@q= h tt2w`t2n`qd" "a@q-,, tt2w`t2n`qd" bm@q&' tt4w`t2n`qd"" dztq 6px tt4w`t2n`qd"" entq ft8 tt4w`t2n`qd"" gzt& _s@ tt4w`t2n`qd"" hnt& o], tt4w`t2n`qd"" iztq %4t tt4w`t2n`qd"" jntq 7d4 tt4w`t2n`qd"" lzt& /)h you're a rich girl and you've gone too far because you you're a rich girl and you've gone too far because you know it don't matter anyway of course, hall and oates. money might not get you far but for kids looking to showoff it gets you followers. >> rich kids flaunting their be affecting other kids more than you realize. here's abc's nick watt. >> reporter: they do say if you've got it, flaunt it. >> i probably spend around $15,000 a month on just shopping. > i've been getting it since i was 14. >> reporter: these snot-nosed kids have it, and boy do they want the world to know it. >> it became addictive. i posted photos of my life. >> reporter: so-called rich kids of instagram are sharing photos and videos of everything from private jets to parisian hotel suites.

30 a day and try and post them. we wanted to find out what it was that was driving them to do this. >> reporter: so director oscar humphries made a documentary called "rich kids of instagram." what goes on in the worlds of the top 1%. instagram is kind of like a portal into people's lives. >> i see instagram as my canvas. if i was an artist, i would like to paint the picture of my life. >> reporter: some of these kids have hundreds of thousands of online followers. >> when you get a lot of attention, it can be intoxicating. >> reporter: i've no doubt santa will be kind to them, but is this naughty or nice? what are the cars, the cash doing to their followers making them feel a little disappointed in their own reality and rkoi-induced fomo. that's the fear of missing out in teen speak. >> they're showing an extreme version of their lives. for children that are

can lead to increased risk of depression and loneliness. >> if i'm showing off, what are you going to do about it? are you going come and stop me? >> reporter: i'd like to. i think i'd like to. nick watt, abc news, los angeles. >> it is quite interesting actually looking at the photos. rkoi. >> unfollow. there is an unfollow button on instagram. >> but it's so interesting. a lot of scantily dressed kids there. on rkoi. let me say. all right. last-minute shopping. >> trina trinh is at macy's to

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some people do their best work under pressure. trina trinh is in macy's in new york's herald square to see what the last minute scene is like right now. >> reporter: hey, reena and kendis. that's right. it's christmas eve and there are still shoppers out and about. it's crunch time. and i am so surprised at how many procrastinators there are among us. we're going to try and talk to a few and see what they've got. here are some guys who i found earlier. introduce yourselves. >> i'm abraham. >> i'm jen. >> reporter: hey, guys. be honest here. why are you out shopping at the last minute like this? you had all year. >> it's a family tradition. we wait up until the last 24 hours to shop for people. >> reporter: okay. >> and you want to know what i have. you want to know what santa's got in the bag. you want to know what abraham's got in the bag.

>> reporter: what did you get? >> we've got look at there, beautiful eskimo hat. >> that looks like you got that for yourself. >> it fits me perfectly but i've got a very -- my head fits a lot of people's heads. there is going to be for many people. if i'm feeling generous enough, it could even be for you and some jeans. 34/32. i'm not a 34. i'm a lot thinner than that. >> who are the jeans for? >> they're for my grandpa. >> reporter: oh, he's going to >> buddy. his favorite brand. levi's. >> reporter: okay, guys. good luck. >> merry christmas. >> reporter: there you have it. they braved the crowds. there's still time if you want to get out there. to finish cross off their christmas lists. back to you guys. >> thank you, tina. >> i think they're out photobombing tina. so about 10% of people actually

>> i remember when the clintons were at the white house, bill clinton always waited till christmas eve to go to the shopping mall. pentagon city. but you never wait. you don't take the clinton approach. >> this is really what my shopping experience looked like on wednesday. >> you're always so thoughtful. >> my god, you should see. >> you're not a grinch. you're not a grinch, kendis gibson. merry christmas to you. >> you're expensive. >> i am expensive. that's the news for this half hour.

hour merry christmas, everybody.ding parts of the u.s. leaving millions in danger this christmas eve... good morning las vegas! i'm dayna roselli... and i'm xxx.... the time now is ... let's get to greg bennett with a weather first check, greg? looks like our holiday cold front has gotten a little bit stronger! high temperatures today will be in the mid and upper 50s with partly cloudy

into the overnight.