At least 2 million Xbox Live users have logged into Facebook this past week, which I guess means the feature is a bit of a success. (You’ll recall that Microsoft launched Facebook and Twitter to so much enthusiasm last week.) Mysteriously, Microsoft didn’t reveal the number of people who logged into Twitter. Is this the end of Twitter?

No, of course not. Maybe it just means that Xbox Live users don’t see any value in using Twitter when there’s no way to click all those bit.ly links?

In related “social” news, Microsoft says that around half a million Last.fm account were created ...

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