Tampa Twitter hacker agrees to three years in prison Graham Ivan Clark, 18, pleaded guilty to fraud charges for a hack of several Twitter accounts last summer. Â Â Graham Ivan Clark, 17, of Tampa, was arrested on 30 charges. Authorities say he was the "mastermind" of a July 15 Twitter hack scheme which gave him and two others access to the high-profile accounts of Bill Gates, Barack Obama and many other celebrities with millions of followers. At left is a message sent when Apple's Twitter account was hacked. [ Hillsborough County Sheriff's Office | Twitter ] Updated Mar. 16 TAMPA â The Tampa teen who took control of well-known Twitter accounts last summer and used them to solicit more than $100,000 in Bitcoin pleaded guilty to state charges Tuesday in exchange for a three-year prison sentence.