Some 2 million Xbox Live users have logged into Facebook since it launched over the service on November 17, Microsoft says -- which means about 10 percent of the total userbase has tried the new feature.

Discussing early indicators of strong performance for its social networking features with CNet, Microsoft also said that Xbox Live users have created half a million Last.fm accounts in the first 24 hours.

Spokesperson David Dennis did not provide specifics on Twitter usage over the service, except to note "tweets from nearly every market where we have Xbox Live."

Facebook, Twitter and Last.fm are all available to Xbox Live Gold subscribers, as part of Microsoft's stated goal to make its console "the largest social network connected to the TV."

Hoping to entice Silver members to try out the new features, Microsoft has also announced free weekends in the month of November, during which Silver subscribers can access services normally only available to Gold users.