Gotta love sensationalist headlines...
Should read: Facebook CTO says purchasing servers for a separate startup prior to Facebook might have been unnecessary
The idea that Facebook wouldn't need its own data centers is pretty ridiculous, and that's what the title implies
EDIT: looks like "while at FriendFeed" was added for clarity ... Further edit: The title is changed now, but the original said "Facebook CTO says purchasing servers was his biggest mistake" or something of the like