The 71-year-old actor, who is yet to break the record of highest fan following of Salman Khan (19,143,677 likes), thanked his admirers for their love and support.
"15 MILLION ! FaceBook crosses 15 million for me! That is some number considering I only started 686 days ago!," Bachchan tweeted.
The 'Yudh' star is quite active on social-networking sites.