Every day, Mark S. Zuckerberg receives hundreds of friend requests, phone calls seeking tech support to unlock accounts, and letters with complaints, demands and suggestions to improve Facebook.

The irony is that Mr. Zuckerberg, a bankruptcy lawyer in Indianapolis for the last 38 years, gets regularly blocked from his own personal and business accounts on the social media site founded by his near-namesake — and he hasn’t been able to get the company to solve the problem.

So last week, Mr. Zuckerberg filed a lawsuit in Marion County Superior Court in Indiana accusing Facebook’s parent company, Meta, of negligence and breach of contract after continually deactivating his business account “for unjust and improper reasons.”

Though the reason is singular: The site’s algorithm repeatedly flagged his accounts as “fake” because he is not the social media tycoon Mark E. Zuckerberg