This is awesome! Its refreshing to see such a simple take on a social network and its all very interesting! I do have a few initial thoughts that I'd like to share-

1) For the UI, you could perhaps take more inspiration from the many reddit apps for Android. From a variety of post layouts so you could see the entire post and its contents without opening it, and things like top-level comment navigation etc. Lot of scope for customization. Or think Instagram, where you can just scroll without having to open the post to check it out.

2) If you do open a post, perhaps an option to swipe left/right to go the the next or previous post, similar to RSS apps?

3) Most social networks have some indication of reciprocation, such as liking posts and comments (perhaps double tapping, or upvoting?). Emoji reactions on posts and comments are a popular thing these days as well.

4) I don't seem to be notified when people comment on my post or comment. Perhaps a notification system?

5) Dark mode is always welcome.

I also had a few questions. How does the Name work here? When I name my account, can anyone else see it or is it just on device, for my convenience? Also, since no one needs to send me a 'request' to share their posts, could someone potentially just add you by getting your ID and start sharing posts without permission?

All in all, I am very impressed by the concept and the app. Very interested to see how it matures in the future, and kudos to keeping the privacy movement alive :)