Bollywood megastar Amitabh Bachchan is upset with the fact that someone has created a Twitter ID replicating his and is writing "rubbish" about Shah Rukh Khan's just released sci-fi superhero film "RA.One".

"Fake ID of mine being used to write opinions on 'RA.One'...I have not even seen the film and shall always wish the best for Shah Rukh," the 69-year-old posted on micro-blogging site Twitter.

"Someone using my fake ID and writing rubbish...My ID is @SrBachchan ...fake ID being disgustingly used is @SrBachhann. And not just these comments on 'Ra.One'...many malicious, completely false accusations are being directed to me...I will not tolerate!" he wrote.

Amitabh, who has given his voice-over for the film, says there are many things said about him which is completely untrue and he will not tolerate it for long.

"Of late a great amount of negative, malicious, completely untrue remarks being written against me...I shall bear with silence...BEWARE, THE FURY OF A SILENT MAN," Amitabh further posted.

"There's a limit to what can be said, a limit to what I can tolerate .. much is in my control...think well before you malign me!!"

Made at a budget of over Rs.150 crore, the film is jointly produced by Eros International and Shah Rukh's production company, Red Chillies Entertainment. It was released across the globe on Diwali Wednesday.

Directed by Anubhav Sinha, the movie has Shah Rukh playing the lead role along with Arjun Rampal and Kareena Kapoor.