Some Reddit alternatives are popping up.

Highlighter is a good and different use. There are a number of devs working on different applications. nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft probably has 10 more coming out this week. 😂

The #nostr protocol has such simple building blocks that a lot of uses are being explored.