Hey, we're building a social site and running into the wall every social app hits, so we figured we'd share honestly and maybe get some wisdom from people who've been through it. What we're making: it's called Heeyyo , a free website for meeting people through anonymous group chat and video. No phone number, no real name, you just pick a nickname and you're in. Somewhere between Omegle and a group chat. The problem: it's only fun when people are online, but no one stays when it's empty, a...