I finished reading The Dark Forest yesterday, and I really really liked it. I liked the previous book, but I wasn't a big fan of how it was written (or the translation, I read that one in Spanish), and the story wasn't as entertaining.

This one takes it to another level, and it's goes very deep philosophically in many very different things: literature, art, love, civilizations.

Can't wait to read Death's End, I hope it's as good as this one.

Scuttlebutt is also an interesting decentralized social concept https://www.scuttlebutt.nz/

Then there's Akasha, built on Ethereum and IPFS https://akasha.world/