addendum 32/30
there's a separate thought experiment you could do about what it really takes for a "social networking protocol" because honestly you don't even need http. you can do "social networking" over xmpp or email or whatever. or invent your own way to send bytes over tcp/udp/whatever (inb4 xkcd)
seriously tho, newsletters and deltachat and movim and a bunch of other things show that you can do it