In the week since the United States presidential election, Elon Musk has used X, the social media platform he owns, to reiterate his support for President-elect Donald J. Trump.
Some of the platform’s users have decided that they would rather post elsewhere.
Among the largest beneficiaries of that desire is Bluesky, a rival service that has gained more than a million new users in the week since the election, a company spokeswoman, Emily Liu, said on Tuesday. The majority of the new users live in the United States, Canada and Britain, she added.
“We’re seeing increased activity levels across all different forms of engagement,” she said in an email.
Bluesky, which began in 2019 as a project by the Twitter founder Jack Dorsey, is among several challengers that have each experienced bursts of momentum since Mr. Musk’s acquisition of Twitter in 2022 and subsequent rebranding of it.
The accounts created on Bluesky this week, many of which are left-leaning, shared cat videos alongside their hopes that the platform might offer a reprieve from the misinformation and hateful speech that have swirled on X since Mr. Musk’s takeover.
New or freshly active users on the platform include celebrities (the rapper Flavor Flav, the author John Green), Democratic political figures (Representative Alexandria Ocasio-Cortez of New York, Chasten Buttigieg, husband of Pete Buttigieg, the transportation secretary) and media personalities (Mehdi Hasan, Molly Jong-Fast).