Maybe check and participate here:
And here:
I have no ideas specifically relating to metadata occlusion though. Except for Tor and HTTPS encryption.
There seems to be a lot of discussion lately about anti-censorship usage of IPFS for instant messaging and chat. Personally I think that instant messaging would be better served by something older fashioned like IRC. Something that just sends messages from one computer to another and doesn’t worry about storing them long term. But that’s just to me. I get people wanting a more modern solution that works as a proper social network.