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nash greer, a superstar, on vine. a twitter app for making short movies. really short. een making movies all morning. we're going to see those in just a moment. first, let's see some of the videos that made him a phenom. more popular than justin bieber and miley cyrus. but nash greer doesn't really sing. >> will you marry me? >> reporter: the 15-year-old sophomore has become something of an internet star. thanks to twitter's popular video app, vine, where users post six-second minimovies. today, there are 13 million vine users. six-second spielbergs sharing moments. sweet. hilarious. when greer started in april, his focus was on his 4-year-old sister, skylyn. he's made 125 videos so far, for his 1.4 million followers. that makes him the 23rd most popular vine user. >> he wants to make people laugh and smile. >> reporter: that he does. his growing legions of fans can't seem to get enough. >> we got that boom, boom pow. >> awesome. terrific. nash grier all morning long. you've been shooting vines all morning long. update, however. breaking news. it's now 1.5-plus million f