That's true. Ycombinator had a startup that was doing captions for youtube videos! Something even smaller than what I do, and the startup was acquired by youtube for $3 Millions, if my memory is not hanging up.

It's based on facebook, it's one of the business challenges we are aware of, but can be extended to other social media websites and on the websites itself.

we are starting small and then we will replicate and expand as we go.