buzz.xyz
Nostr is an independent open protocol created by fiatjaf in March 2020.
Jack Dorsey has supported it with funding (he likes decentralized tech).
#Nostr has been running ~6 years.
Gained real traction in late 2022.
Solid niche popularity in Bitcoin/privacy circles: hundreds of relays, many clients (Damus, Amethyst, Primal...), Lightning zaps, and growing developer activity.
Not mainstream scale yet, but active and censorship-resistant.
Perfect base for decentralized setups like #Buzz!