If you had any doubt if YouTube, Vine and online video in general is a “thing,” go ahead and mark your calendar for VidCon 2016! Just a few short days ago, about 20,000 attendees converged on Anaheim, California for the sixth annual VidCon, a three-day conference that brings together top YouTube creators, online video leaders and, most importantly, the community of fans that make the interwebs so great. This was…