Social network and X competitor Bluesky’s massive growth slowed in December in the U.S., after having surged from 9+ million in September to north of 20 million users in November.

The slowdown is based on an analysis of web traffic and mobile app daily active users by analytics firm Similarweb, which found that Bluesky grew less than 10% month-over-month in December 2024, compared with 189% growth in November.

Daily active users of the Bluesky mobile app in the U.S. also grew 12% in December, compared with 284% growth in November, the firm says.

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