The Facebook feature has been used the most with company spokesperson David Dennis detailing that the first-week figures show that at least 2 million Xbox Live users have logged into Facebook. CNET cites Dennis as saying 120 million minutes of music were streamed from Last.fm and half a million Last.fm accounts were created in the first 24 hours of availability. While there were no specifics for Twitter, Dennis says there have been "tweets from nearly every market where we have Xbox Live."
Have you been using Facebook, Last.fm or Twitter via XBL? Let us know in the comments below!