Their 'rivalry' is fodder for much gossip but Amitabh Bachchan who recently joined Twitter, congratulated Shah Rukh Khan for notching up 400,000 followers on the social networking website.
       
"Congrats!! you crossed 400,000... meri gaadi thoda dheeli chal rahi hai (I'm going at a slower pace at the moment)," the actor wrote on his Twitter page.
       
Bachchan currently has 98,228 followers on the website and he also has a voice blog and a mobile blog. The veteran is learning the new technology, but is sometimes baffled by it.
       
"I want to learn the ropes of twittering through the mobile BlackBerry. Here there is limited success. And just when I am about to scream out my achievement, the office informs me that the mobile company whose sim card I carry on my BB has a major glitch and shall be shut for 3 hours," wrote Bachchan on his blog.