>3. No likes. No scores of any kind. If you show people a number, they will try to make it go up. No one tracks a score with their friends.
I agree with most of these, but I'm iffy on this one. "No one tracks a score with their friends" is not really true, it makes people feel good to see encouragement and feedback from their friends. There's no reason that encouragement has to be restricted to text comments and messages. Without feedback, you're essentially just screaming into the void knowing someone could be listening.
If the things I'm posting could get feedback but don't, that tells me that the things I'm saying aren't really hitting with any of my friends. That's a valuable thing to know, whether or not you choose to act on it.
Facebook in the early years was for the most part exactly like what you are suggesting, but with likes, and I at least remember it being a pretty enjoyable place for a few years there (I joined at the very end of 2006).