Singer and actress Demi Lovato quit Twitter and Instagram on June 20 after getting fed up with trolls. She urged them to "pay more attention to good than bad." But luckily she returns and tweets, "I'm back.... And I'm coming back more honest than ever."
British actor and author Stephen Fry quit Twitter in February. "I have indeed deactivated my Twitter account," Fry wrote on his blog. "The pool is stagnant. It is frothy with scum, clogged with weeds and littered with broken glass, sharp rocks and slimy rubbish. If you don't watch yourself, with every move you'll end up being gashed, broken, bruised or contused. Even if you negotiate the sharp rocks you'll soon feel that too many people have peed in the pool for you to want to swim there any more. The fun is over."
"Agent Carter" actress Hayley Atwell quit Twitter and Instagram in 2015 so she could keep her life more private. "Thanks for following! Leaving Twitter now. It's been a blast," Atwell wrote in her last tweet.
"Avengers" director Joss Whedon -- best known for his hit TV series "Buffy the Vampire Slayer" and "Firefly" -- quit Twitter in 2015. "Twitter is an addictive little thing," Whedon told Buzzfeed, "and if it's there, I gotta check it. When you keep doing something after it stops giving you pleasure, that's kind of rock bottom for an addict. I just had a little moment of clarity where I'm like, You know what? If I want to get stuff done, I need to not constantly hit this thing for a news item or a joke or some praise, and then be suddenly sad when there's hate and then hate and then hate."
The "Star Trek" actor Simon Pegg quit Twitter in 2014 to concentrate more on his work and less on chatting or arguing with fans, though his PR team continues to post updates on his projects. "I haven't been enjoying it for a while now," Pegg wrote on his blog. "There hasn't been a specific incident and the reasons are various. Ultimately, I think we've just grown apart. What I'm saying is,' it's not you, it's me.'"