SAN FRANCISCO — The writer Salman Rushdie hit Twitter on Monday morning with a flurry of exasperated posts. Facebook, he wrote, had deactivated his account, demanded proof of identity and then turned him into Ahmed Rushdie, which is how he is identified on his passport. He had never used his first name, Ahmed, he pointed out; the world knows him as Salman.

Would Facebook, he scoffed, have turned J. Edgar Hoover into John Hoover?

“Where are you hiding, Mark?” he demanded of Mark Zuckerberg, Facebook’s chief executive, in one post. “Come out here and give me back my name!”