I'll just refer to my previous comment about twitter.

http://news.ycombinator.com/item?id=378541

Outside hacker news and "Valley-oriented" news-sites I've hardly heard it mentioned.

Twitter may have potential, but it still has massive usability problems, and at large is one of the few services I've signed up for which has offered me absolutely nothing of value and no way to improve on that.

Saying twitter, a bandwidth hole with no actual plan to monetize on its service, is worth millions is clearly overstating its value, even with its current user-base.