TL;DR It uses the Matrix protocol to make every post E2E encrypted in the same way a Matrix chat is. Except they added more separation between people in the “Circles” functionality. Instead of everyone seeing all content like in a chat room, you have to invite people to follow your timeline. And only those people who have been invited can see your posts, and vice versa. I’m not sure he said it specifically, but it was implied that unless people have invited each other to see their posts, they can’t interact with each other in the same circles (he used an example of two people not liking each other and both being able to see a 3rd person’s timeline, but not each others timeline/posts). So essentially it offers encryption and social media like usage but with a sane privacy stance…aka nobody can find you via stalking your mutuals and nobody can just google and DM you out of the blue. Basic photo and sharing is available, apparently improving those features is what is planned for this year. You can also self host it if you wanted, as it just runs off a Matrix server (although they currently provide a US and Europe matrix server run by the FUTO company that funds the app development). Looks like they plan on charging for storage space (1.99$/month for 10GB is what it says in the app right now), and I’m not sure how much storage you get for free.