- You can write and edit one post at a time.
- This post, in whatever form it has then, gets published at 8 in the morning.
- You can only see posts for today. All old content gets deleted.
- No comments or feedback is possible.
- Only symmetric relationships are possible: you can add someone, but they won't see your posts and you won't see their posts until they add you back.
- All "friend" discovery is out of band. There are no recommendations, no boosting/retweeting, nothing.
This is obviously not a mass medium, but its reductionism gives it some interesting properties that have made me consider what a good social network would be. One post a day is a fantastic idea.
(I don't know if they intend for it to be named in public, so I'll refrain.)