Instagram videos cap out at 15 seconds. Vines? Six. As Steve Goldboom learns, though, those are still too long -- by 13 and four seconds, respectively. Yep, the new episode of his mockumentary series On the Brink of Greatness is all about the ridiculousness of social video apps. Welcome to the future where celebrities are made overnight and all they need to do is have a door slammed into their face while someone points a cellphone at them.