500 million Facebookers
Well, I guess I just have to post this one as well.

Really, it's okay!
1:2 - Facebook buys Gowalla, FourSquare, or Loopt, and takes home the gold. this is the default.2:1 - Apple buys one of the above, and/or Square, gives Facebook a run for the money. probably still loses, because Facebook has too much frequent user activity, Connect, and Apple doesn't move fast enough in software.3:1 - Google buys Twitter and Yelp, gives Facebook a run for the money. maybe also buys a payment platform, maybe not. probably still loses due to no clue on social, unless they let Twitter figure it out. still not very likely. (they will prob buy Twitter & Yelp, but they won't likely win LBS).10:1 - Microsoft decides to spend a boatload of money buying something or several somethings, and fails miserably... unless it's Facebook. but Zuck won't sell for less than $75B, and Ballmer doesn't live up to the first half of his last name. so therefore Microsoft is FAIL, and probably hard & painful FAIL.50:1 - Google or Apple figures out a way to buy or merge with Facebook. This is completely looney tunes, but would be the right move. however, Google can't likely pull it off without antitrust violations stopping them in their tracks. and even if Jobs buys the farm, i don't think he gives Zuck the crown unless some very unusual scenario comes down.
Some stats from May 2005: