Amitabh Bachchan may be the megastar of Bollywood, but his draw of 37,500 fans on the first day of Twitter was far less than that of Sachin Tendulkar at 79,000. Tendulkar was bitten by the Twitter bug early this month, while Amitabh joined Twitter Tuesday and got plenty of welcome messages from various celebrities. But the 67-year-old, who regularly writes on his blog and also has a mobile blog and a voice blog, is excited with his first day’s...