Activity Pub, The FediVersre and Mastdon are all the same thing. I'm not sure how to best describe it but its similar to Discord i guess. NostrBros hate it since who ever host the instance can ban you or just shut it down but I actually prefer it to Nostr because that's where my No Agenda and PC 2.0 friends are and the PC 2.0 people you have interacted with on here started using Nostr recently to see what Its all about. Basically anyone who helped you go LIT last week.

PC 2.0 has its own instance and all of the interactions you had with StevenB last week were all from his podcastindex account on Mastodon. There is a Mostr bridge that connects Mastodon and Nostr so we can cross communicate with each other. I try to keep the Mastodon stuff on Mastodon and the Nostr stuff on Nostr since the bridge can have issues sometimes but tagging people across the bridge is just easier sometimes.

I think this is your AP instance on Castapod @bitpunkfm@www.bitpunk.fm I found it searching for your Nostr account from Mastodon. 

#rabbitholes 

 Ahhh, they are all the same thing. OK that was the piece I was missing. Ty.