(Ideas are worthless. Execution is all that matters.)
Writing a "tell all" book and trying to sell it?
Blatently violating the Google TOS, and then suing them because they wouldn't tell you what part of the TOS you violated?
That's 3 pretty big reasons.
First of all, it's a really really old idea.
Second of all, the idea is irrelevant. What made Facebook succeed was the execution. That goes for most of the other online successes as well. Selling books online, or search, aren't novel ideas. Amazon and Google, too, succeeded because of execution. They all did.
I think more people would feel that way if legal action wasn't involved. Suits & lawsuits tend to leave a bad taste in people's mouths...
See now even I dislike you a little & I'm not an entrepreneur :)
I'd be curious to know the general thought on how often it's appropriate to get yourself into these types of legal issues. (AG seems to have a pretty loose trigger finger when it comes to serving papers.)
I don't know when Friendster launched, but i know people who've had profiles since 2002, so again, a "social networking site" had already been done and launched.