Then head over to https://mostr.pub and use the tool to find people on Mastodon or Lemmy using their username (ex: @username@example.com)

It'll then spit out the npub for that user, which you can then follow from #Nostr so long as you're using mine or the Mostr relay 😎

Big s/o to nostr:npub108pv4cg5ag52nq082kd5leu9ffrn2gdg6g4xdwatn73y36uzplmq9uyev6 for building Mostr 💟

nostr:note1w9zvqjfel23y6f6h0cftdca5lkwk5a849twxehr9zveduhcln7nqqw853t