I like the Facebook system where you had to friend request someone before you were allowed to write on each other's posts. Facebook also had a system where you could make your profile a public.

I am seeing less spam these days on nostr but it's there.

nostr:nevent1qqswfhf8dtc0lx2d67zxprsq688x3vzp4v4fgtfxc0cqkflqf4t38ugpz4mhxue69uhkyctnwdcxjum5dakzummjvuhsygpm7rrrljungc6q0tuh5hj7ue863q73qlheu4vywtzwhx42a7j9n5psgqqqqqqsxuk7uk