SAN FRANCISCO — Twitter CEO and co-founder Jack Dorsey says the social media platform accidentally suspended his account.

Dorsey tweeted Tuesday night , “just setting up my twttr.again (account suspension was an internal mistake).” The post was an echo of his first-ever tweet , which came in 2006.

San Francisco-based Twitter suspended the accounts of several prominent members of the so-called “alt-right” in an apparent crackdown on accounts tied to hate speech or threats of violence. Twitter declined comment, but noted its policies against hate speech and harassment.

Some supporters of the movement cheered Dorsey’s brief suspension with celebratory tweets.