social networks decentralization

hi!
I'm workin on social netwerks decentralization, I'm tryin to use F2F as
framework to decentralize the social networks.
may I have an idea abt Structure of Data used ( for sharing and stockage)
with users profiles and friends-relations 'coz one of my objects in this
project
is to guarantee the interoperabilty between my future framework and existing
social networks.
Regards!