What should Naven build next? One idea per post — vote on the rest

Naven is built by one developer, and the ideas with the most votes here are read every week.

A good idea post says:
1. The problem — what you were trying to do, and what got in the way.
2. Your idea for fixing it.
3. Who else it would help.

Before posting, look for the same idea and vote on it instead. Ten votes on one post say far more than ten separate posts.

Some things Naven will not build, so they are not worth a post: end-to-end encryption that stops screening, advertising, selling data, or public profiles that let strangers find you by name.