The FBI announced on Tuesday that 10 people had been arrested for allegedly targeting Facebook users with malware designed to steal credit card and bank account numbers. The operation exemplifies how deep technical knowledge is not needed to run a lucrative botnet, a security expert says. At its height, the botnet was one of the world’s largest and included compromised machines in half of Fortune 100 companies and hundreds of government agencies. Facebook has not seen any activity from a botnet since October, the social network says.”]