The Guardian reports that Microsoft's presence of Facebook is pretty huge though the BBC has a higher % of employees on there. I can attest that FB has been out of control within Microsoft for the last month or so - not a day goes by when I don't get a new request or notification of some kind.
You can find me over here and also the group I setup - Friends Of Blue Monster which has over 500 followers of the Microsoft: Change The World Or Go Home cartoon
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Go Steve, Go Steve...MS working on any facebook apps?