Is Facebook's Spam Creating an Exodus?

So there is continued discussion about the Facebook “adults” leaving Facebook behind because it’s making them batty (or at least they’re getting bitten by vampires and zombies which isn’t good). Rory Cellan-Jones uses yesterday’s statistics from the U.K. that Facebook has suffered its first monthly decline since becoming the largest social network in the U.K. as evidence to support his argument of an adult exodus.