Signal seems to cover everything that snapchat does? Other than the Discover content, which I never use
Is it federated in any way?
Ah I didn't read that properly
Signal is the closest privacy / security respecting alternative to snapchat that I've found but no it isn't federated.
No.
Is temporary posts the feature you're looking for?
One weakness of open platforms like activitypub is that it's hard to ensure that your post is deleted. A bad actor can make a permanent copy of data they receive through activitypub.
Pixelfed has a "stories" feature. It's only on the website version (no apps) and it's labeled as "beta".
What features of Snapchat are you looking for?
There's PixelFed but that's more analogous to Instagram, but it's core feature is image sharing which is what Snapchat primarily is for.
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy