Short-form posting platform Bluesky crossed the 15 million user mark today amid a recent surge of user signups in the wake of the US presidential election. That’s according to a stat-tracking site put together by Bluesky developer Jaz, using the Bluesky API.

The platform, which rests on the decentralized AT Protocol, added about a million new users in the last week. Bluesky COO Rose Wang recently told The Verge that the “majority” of new users flocking to the platform have been from the US. The Bluesky app is currently at number one in the iOS app store, followed by Threads, ChatGPT, and the Google app.

Meta’s Threads is still outpacing Bluesky, having recently hit 275 million monthly users and growing at a rate of over a million signups per day. But Bluesky offers a very different experience. Both are ad-free (for now), but whereas Threads uses a single Meta-made algorithmic feed, Bluesky offers user-created algorithmic feeds in addition to its “Discover” and “Popular With Friends” ones.

New features that Bluesky has recently rolled out include video posting, pinned posts and custom fonts, and a slew of “anti-toxicity” features that let you do things like detach your posts when someone else quotes them.