Can I link Aadhaar card with facebook and other social media accounts ?

As on Aug 2019, you dont need to link Social media account with Aadhar card. Also, there is no process to do the same as well.

This matter is under Supreme Court now.

Government of Tamil Nadu has informed that the linking of social media accounts with Aadhaar numbers will help in combating and tracking fake news, malicious posts, content that poses a danger of inciting violence, dangerous games such as Blue Whale and any anti-national posts. Linking every social media account with the Aadhaar number does add a face or an identity to what could otherwise be a typical anonymous online identity.

Facebook has argued in court that any mandatory linking requirement for of Aadhaar or any other identity document issued by the government goes against the guidelines of the Constitution Bench in the Aadhaar case.