Just my attempt at starting a rumor that should become reality. Can't you see the headline now?
Here's why Microsoft should buy Facebook:
i) Facebook is the definitive social network platform play. Microsoft understands platforms.
ii) Microsoft has no capability anything close to Facebook. It would get them current in the web world.
iii) Facebook has the largest engagement of the new developer community. This is the asset that made Microsoft so successful in the past and the asset needs to be renewed and reinvigorated.
iv) Plus, both founders went to Harvard....it'd make a good story.