Liam Hemsworth joined Twitter yesterday despite not being so fond of the site back in October 2009, when he convinced his now-fiancée, Miley Cyrus, to deactivate her account. Both stars have active accounts as of Wednesday, and Liam's first official tweet read, "Glad to be on board. Thanks for following." While he's only following 13 people, including Miley, Liam has already racked up over 70,000 followers in less than 48 hours. To celebrate his induction to the social media site, we've rounded up a list of celebrities who have a history of changing their minds about the micro-blogging site. From Megan Fox's confusion with Twitter's purpose to Ashton Kutcher's online silence following a controversial tweet, celebrities go back and forth with 140 characters.
Click through now to see all the Twitter quitters and find out why — at the end of the day — they can't seem to stay away!