I'll give my take, for the possibility of not seen in this broad participation.

Nostr is a network for free and uncensored communication. You can write messages, share pictures, follow people and send zaps to support them. Zaps are small amounts of money that you can send and receive using the Lightning Network. Nostr is not a website or an app, it's a borderless world that anyone can access. You can choose different apps or websites to use Nostr.

nostr:note12p84rhvz74t90e60g4gxr60k4eymz8jxc9tsmumr462wx9t6rdgq5d8wde