In Nostr, users multi-post their tweets to “relay servers”, and relay servers push it to you. Follow actions are a type of tweets as well so all relays can know who you are following. You can also have as many relays as you want.
Isn’t it going to waste a lot of bandwidth, you may wonder. It does!
Huge benefit of Nostr architecture is that your identity is based on your generated private key and optionally a DNS name you happen to own, so any server operators’ opinions about you won’t affect your identity.
This happens a lot with existing platforms, not limited to Twitter. “Yesterday evening I took pictures of gorgeous Egyptian sand hills, and since this morning Google left me saying I violated them, now even the embassy says they can’t verify my nationality status” - can’t happen on Nostr.