@
Andreas M. Heitmann :batman: Define "similar".
As for Tumblr: For one, there's Wafrn which aims to be a direct drop-in replacement for Tumblr. Downside:
The project website is also the only instance (so far?).As for Facebook: @
Mike Macgirvin 
has spent the last 15 years developing about
a dozen Fediverse server applications which are (also) designed to be alternatives to Facebook. Today, there are still
Friendica (2010),
Hubzilla (2012/2015),
(streams) (2021) and
Forte (2024).
However, if what you're looking for is "literally Facebook without Musk and with ActivityPub", as in a 1:1 Facebook
clone that looks like Facebook and feels like Facebook just like Bluesky looks and feels like early Twitter, then you're out of luck. All four are "better than Facebook" Facebook alternatives that add useful stuff on top, but that don't look and feel close enough to Facebook for nobody to have to learn something new. The closest you'll get is Friendica if the node in question has the
Bookface theme installed.
Even then you'll have to "install" Friendica on your iPhone as a progressive Web app through Safari and use its own Web interface (which is mobile-compatible). There is no native app for Friendica for the iPhone in the Apple App Store. There's one in development, but it's far from complete. And while Friendica supports Mastodon apps, a Mastodon app only covers a small fraction of Friendica's features, it leaves out some features that you'll need daily (simply because Mastodon doesn't have them), and I'm not sure if there's any Mastodon app for the iPhone that works with Friendica; it has officially only ever been tested with Android.
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