New Delhi, May 22 (ANI): Bollywood megastar Amitabh Bachchan is known as "shenshah" for a reason and the actor has maintained the same on social media as well. With 21 Million followers on Twitter, Amitabh Bachchan has now become the most followed Indian celebrity on the micro blogging site. The 'Piku' star has beaten the likes of superstars like Shah Rukh Khan, Salman Khan and Aamir Khan. Amitabh also took to Twitter to share the good news and on the top, the news was also trending on social media site for a day. Being the optimistic he is, Amitabh also tweeted that he is now eyeing for 25 Million followers. The actor is very active on social media and he keeps sharing his personal and professional experiences to his fans.