"No. Just because I like to have a drink at night. I could
easily say something stupid, and I also don't think you need to be that available," he said.
The 'Gravity' star said that he cannot imagine actors Matt Damon or Brad Pitt wanting to join the social network anytime soon, reported Digital Spy.
"I don't see Matt or Brad or myself wanting to get our thoughts out in a 140-character-thing at three in the morning," he said.
The 52-year-old actor had slammed celebrities who join Twitter and said, "I think anyone who is famous is a moron if they're on Twitter. It's just stupid.