Chris Brown deleted his @mechanicaldummy Twitter account back in 2009 after controversy surrounding his album release and a series of disgruntled tweets. In 2010 he returned to the scene where he now remains as @chrisbrown.
The Dream left Twitter after angry Ciara fans thought that he dissed her and attacked him through the social media network. Of course, he too returned and even recently found himself engaged in Twitter beef.
When he couldn't take the heat from the trending topic #ifsouljaboysarapper, Soulja Boy deleted his twitter. Like many of the rest, he could resist coming back.
Kid Cudi called it quits with Twitter after making the decision that he wanted more privacy.
Kanye West got rid of his Twitter after people repeatedly believing that it was fake. He's now back as @kanyewest