– Celebrities have a very love-hate relationship with Twitter, evidenced by these stars rounded up by Perez Hilton. All of them have quit the social networking site—at least for a while. A sampling: Miley Cyrus quit Twitter in 2009, at the urging of her then-boyfriend Liam Hemsworth. She's back now. A feud with a fan site leaking her songs was enough to push Nicki Minaj off Twitter in 2012. She, too, is back. Alec Baldwin has quit Twitter a number of times. Most recently, he left after a controversial rant, and said he'd never return. His foundation is still on there, though. Mega-tweeter John Mayer briefly quit in 2010. Supposedly, his love of Twitter caused Jennifer Aniston to leave him. Not surprisingly, he's back. Haters and Internet trolls, sadly, drove Adele off Twitter, but she came back (or at least her official account did). Keira Knightley joined Twitter with a fake name, but only left the account open 12 hours. Chris Brown has quit Twitter more than once. But don't worry, his account is active at the moment. Click for the complete list of 15.