Amitabh Bachchan, who joined Twitter a few days ago, congratulated actor Shah Rukh Khan for having as many as 400,000 followers on the microblogging site.

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"Congrats!! you crossed 400,000... meri gaadi thoda dheeli chal rahi hai (I'm at a slower pace at the moment)," the 67-year-old posted on his Twitter page.

Amitabh, who has become a regular on the site now, presently has 98,228 followers. While he writes on his Twitter page couple of times during the day, he also has a blog, a voice blog and a mobile blog.