My objection to all of this stuff is...
...why the fuck would I want my peronal information/communications to be managed by some anonymous fly-by-night?
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I barely tolerate my ISP. Hotmail/Yahoo mail are still an "in the event of an emergency only" proposition. All this stuff like Friendster, online dating, etc., just wigs me out. There are 21 sites that have permissions to set cookies in my browser, and several of those are related hosts within a domain. Sorry, I know what you can do with a database of 50k - 100m users, with linkable characteristics. You ain't gettin' mine.