Could you share the brilliant startup idea you come up with after seeing this video?

I sense a tongue being held firmly in your cheek, but I'll play to it. There are at least a few ideas in here, if the video is representative of a trend (that has yet to be determined) or boom area.

One off the top of my head: Provision of camera and interactivity systems for concerts, so remote fans and musicians can interact better. Imagine if Folds could get 50,000 fans worldwide paying $10 to watch a gig with more interactive elements like this.

I think you're overly optimistic about what's going on here and overlooks trolling. I don't know if the video was edited to not show the offending ones. But I'm pretty sure if this becomes a popular trend, you'd have to deal with more trolls than you'd like to.

Maybe you're right and there's some hidden potential behind all of this. But the cynic in me just imagines 4chan members drooling at the prospect of ruining a show with shocking images and videos.

True, and one of the first things I did on ChatRoulette was prank people with it - http://youtu.be/DKTPLTZa6d4

But if people were paying good money to be in such a system (for, say, a live gig).. maybe such shenanigans would be mitigated.

Well for a start, it's brilliant PR/marketing.

People will see this, and think "Woah. If I play on chatroulette, I could be famous".

I can see ways you could integrate that sort of PR into other startups.