[gruez]

>And did you know there's a secret YC-founder only feature. founders funded under YC can see each other as orange usernames. The rest of us.. Well. They can collaborate publicly as a bloc but the rest of us are none-the-wiser.

Can't you do this on any forum by having your co-conspirators install some sort of a userscript/userstyle? I guess it's more convenient to do it on the site yourself if you own it, but it's not exactly that much of a competitive advantage.