Sylvester Stallone: Twitter is 'crazy'

Sylvester Stallone refuses to use Twitter.

The 'Bullet to the Head' actor used to go on the social networking site but decided to quit his account because he didn't like opening himself up that much.

He told Nuts magazine: ''I used to tweet but it's an act of futility. You're not really making any impact and if you find yourself in a mood when you wanna be a bit controversial and you post something, you suddenly realise, 'Oh my God!' because you've opened yourself up to a bunch of criticism from strangers. It might be a great promotional tool but just to make small talk, it's crazy.''

While he isn't a fan of new media, the 66-year-old actor says he's always looking for a new challenge in his life.

He said: ''Few people who fall try to get back up again but they'd be surprised - if they tried they might just succeed. I'm always looking for a new challenge. There are a lot of mountains to climb out there. When I run out of mountains I'll build a new one.''