Well, all of this is nostr-only. Nothing gets communicated to Twitter or Facebook. I couldn't really tell you how things look on Twitter or Facebook, but the idea is probably the same in that you're sending similar info (and probably a lot more).
This is just the raw data. Everything you do on internet will be transmitting some sort of data like this. The good thing about nostr is that it's transparent and you can see what info is being passed around 🙂