What is Nostr?

I need another social media account like I need a … oh well, lets see how this goes…
Public Key
npub1nk36tpjshgyknh6zp8ryfqvd5rnrhtdrzmnwfazrtupsfek4pzaq0njr4g
Profile Code
nprofile1qqsfmga9segt5ztfmapqn3jysxx6pe3m4k33dehy73p47qcyum2s3ws25e0at
Author Public Key
npub1nk36tpjshgyknh6zp8ryfqvd5rnrhtdrzmnwfazrtupsfek4pzaq0njr4g