A $240M investment on a $15B valuation means Microsoft gets 1.6%, probably not the best outcome for Mark Zuckerberg. Looks like Facebook's investors are trying to make sure their share doesn't get diluted any further.

Also, this is great. Valleywag predicted the announcement shortly before it happened because the heads of PR at Facebook and Microsoft added each other as friends today: http://valleywag.com/tech/confirmed/facebook-and-microsoft-f...