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 This is true of all social media. There are servers, be they centralized, federated or siloed, or p2p and those servers see the source IP.

The difference is that my Nostr client has built in support for Tor while my Mastodon clients don't, and my Twitter client didn't.

So it seems the Nostr clients that have thus built in are a step up from all the rest in terms of privacy. 
 True, but one party knowing your IP and having a vested interest in protecting it.

On Nostr you're exposing it to many parties with no recourse. 
 I disagree. I think Facebook, X, TikTok and the rest have a vested interest in NOT keeping your data private. In fact, I think their entire business model is predicated on selling ingormation about people, which is the opposite of protecting it.

Some nostr relays undoubtedly do the same, but with corporate social media abuse of personal information is guaranteed.

I think we can all agree that people should use Tor or a VPN or some kind of proxy no matter what they do online, be it shopping, posting cat pictures, or engaging in civic discourse. 
 Amethyst provides a pretty good experience with orbot.  Another good option ( but not an app so less approachable) is using start9 and running your own nostrudel service over tor. 
 Agreed. In fact, I'm using it to write this message. 🤗 
 Exactly. Your IP and anything else they can fingerprint, track and harvest is sold and resold to hundreds of sketchy companies and government agencies.