I wrote an article specifically for the purpose of introducing the Fedivers to potential newcomers. Perhaps you’d like to share it.
Doesn’t what you descript already exist? Mastodon does all of this.
Besides, the Fediverse and ActivityPub is particularly a social network. It’s basically a web of json-ld documents. I expect my posts and data to federate across the entire network for the Fediverse to see, as long as I set my audience to such per post. This is already way better than Facebook, for example, which actively non-consensually scans my phone for contacts, tracks my location 24/7, etc.
Usually, people asking for privacy on social networks confuse privacy with anonymity or pseudonymity, which is an actual problem. Is this what you mean?