At this point my decentralized social network is RSS. Just the right level of interactivity for me!
Take an RSS feed and do the following:
* Hash each entry in your RSS feed including the hash from the previous entry in the feed
* Sign that hash with your private key
You now have the original SSB data structure!
It has overhead. It adds 64bytes for the signature and 32bytes for the hash.
But that overhead is pretty small for most RSS feeds I've seen.