Microsoft's Robbie Bach has said that the Christmas 2009 period was "Xbox Live's busiest period ever", with a new member joining the service every second.
"Xbox Live offers much more than multiplayer gaming," said Bach. "It's a community hub for gamers and non-gamers alike.
"Today over 20 million people are Xbox Live members. Just last week Xbox Live experienced its busiest week ever, adding a new member every second."
It was previously reported that Microsoft has shipped over 39m Xbox 360 consoles worldwide, meaning that almost 50% of users have chosen to sign up to the Xbox Live service.
Now remember that that figure takes into account both Gold and Silver members, so you won't necessarily be able to dominate those 19,999,999 others on Modern Warfare 2, but regardless it's an impressive figure for Microsoft's online service.
Bach also added that nearly 10 million people have logged into Facebook, Twitter and Zune through Xbox Live since their launch on the service at the end of last year. One of them was me.
The latest addition to Xbox Live, Game Room, will launch on Xbox Live this spring. The new service will allow gamers to play retro arcade titles for a small fee.