The Twitter co-founder Jack Dorsey has left the board of Bluesky, the decentralised social network he helped start, and encouraged users to remain on his first site, now owned by Elon Musk and called X.

Dorsey confirmed he had cut ties with Bluesky on Sunday, telling a user on X that he was no longer on the social network’s board. The announcement was apparently unexpected, since Bluesky still listed him as a board member until late on Sunday evening.