Chennai
The actor has thanked all his fans, and said he is now aiming for the 20 million mark.
"18 MILLION...Thank you all... It's been a wonderful ride... now to 20! BAADDDUUUMMMMMBAAAAA," the thespian tweeted on Friday night.
Following close on the heels of the "Deewar" actor is superstar Shah Rukh Khan, who has a following of 16.4 million on the micro-blogging website.
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