Robert Downey Jr. joins Twitter

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'You know who I am,' he posted.

The Iron Man has joined the Twitter age.

Yes, Robert Downey Jr. has 'finally' - to quote a few of his 300,000 and obviously quickly counting followers - signed up with @RobertDowneyJr.

His accompanying (and characteristically droll) identifier? 'You know who I am.' His first tweet? 'Talk to me, Twitter,' alongside a snap of the actor in dark aviators and suit jacket, holding up a sign hand-lettered with '@RobertDowneyJr,' in case there was any doubt about his handle.

So far, he's following a couple dozen co-stars, colleagues and compatriots (Gwyneth Paltrow, Jon Favreau, Jimmy Kimmel). And one very lucky bacon food truck in San Francisco.

Favreau rolled out the digital welcome mat: 'You wanted him, you got him. Ladies and gentlemen, give a big #FF to @RobertDowneyJr #chef'

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