If you're talking about TimBL's Solid, I wouldn't call that a social network: it's a set of specifications for data storage, on top of which people could build

If you're talking about TimBL's Solid, I wouldn't call that a social network: it's a set of specifications for data storage, on top of which people could build a federated social network. (Disclosure: I work at inrupt, TimBL's startup, but this is my personal opinion.)