I recall (but can't find) having seen a social network built on Keybase.io's encrypted filesystem (KBFS), where your public data is signed stored in your public

I recall (but can't find) having seen a social network built on Keybase.io's encrypted filesystem (KBFS), where your public data is signed stored in your public folder, and your private data is encrypted and shared with only those you choose. Everything is based on files.