Trends in Social Web Spam Attacks | Impermium Index
Disturbing trends. For instance:
Online ID signup fraud: Fraudulent accounts range from a low of 5 percent to an astonishing 40 percent of users. Scammers are registering accounts by the millions as they perpetrate fake “friend requests,” deceptive tweets, and the like, while the black market for bulk social networking accounts is growing exponentially.
There’s a good report at Techcrunch