"At dinner with Aamir... coaxing him to come on Twitter. Success come to those that dare and act!! Convinced the inconvincible Aamir over dinner to come on Twitter," Bachchan wrote on his Twitter page.
The 67-year-old actor also posted a picture of him along with Aamir on the website.
"With Aamir at dinner, Italian, good food and the smile on his face is his excitement of being convinced to come on Twitter," Bachchan said.
"A wonderful evening at Italian restaurant. Ronnie, Aamir, Kiran and Jaya...delightful, meaningful conversation (on) films, life, posterity," he wrote.