Vin Diesel believes his 'Guardians of the Galaxy' character is similar to his real-life self.

The 47-year-old actor insists the innocence of his alter-ego Groot - a genetically modified tree who tries to save the world - in the new Marvel flick is comparable to his own off-screen persona.

He explained: ''To maintain your innocence is a feat. So much magic comes from it.

''Ironically, people probably see more of Groot when I'm posting [on Facebook] than they would in any of the characters I play.''

However, despite Diesel's love of Facebook, he argues that stars ought to be more aware of the direct interaction social media allows with fans.

He explained: ''Imagine if you were able to Facebook Elvis, and talk to him, and hear from him without the Hollywood of it all. That was the 'Fast & Furious' experience.''

Meanwhile, 'Guardians of the Galaxy' - which also features the likes of Zoe Saldana, Bradley Cooper and Chris Pratt - is in UK cinemas now.