[neutronicus]

Greplin et al always have the exit scenario where their product is so much better than whatever (say) Facebook has in-house that Facebook buys them as a social-search talent-acquisition play.

This sort of scenario might be easier to identify and invest in than "the next Facebook".

[joe_the_user]

Wouldn't it be a bit worrisome for a company to bargain to be purchased by Facebook when that company is in the position that Facebook could put them out of business at any point by cloning their stuff?

Creating an app as a "talent-acquisition play" seems reasonable but wouldn't you want to position yourself for multiple offers? If Facebook buying for talent, it doesn't have to restrict itself to the creators of Facebook apps.