Los Angeles, April 12 : Actor Robert Downey, Jr., popularly known as 'The Iron Man', has joined social networking platform Twitter. He wants to know how thoughts could be restricted to 140 characters.

"(I'm) loving all the love, folks. It's been a blast. Though can somebody please explain how anyone can keep their thoughts to 140 characters (sic)," Robert posted on his Twitter page Friday.

Having amassed immense popularity for his superhero role in "The Iron Man", Robert is currently awaiting the release of "Chef" and "The Judge".

Meanwhile, he's presently shooting for "Avengers: Age of Ultron", the second part of the Avengers franchise.(IANS)