The 'PINK' star is extremely active on social media platforms and uses the medium to share updates about his personal and professional lives with his fans and well-wishers.
On achieving this milestone the Shahenshah of Bollywood took to his Twitter account to thank his fans and well wishers.
The 74-year-old, who is always upbeat about new experiences, was the first celebrity to start a blog and update it on a daily basis and when Twitter came into existence, the 74-year-old' star soon became the celeb with the highest number of followers.
On the work front, Big B is currently working on 'Thugs of Hindustan' alongside Aamir Khan. He will also be sharing screen space with his old friend, Rishi Kapoor in '102 Not Out'.