Synereo, Diaspora, and other decentralized social networks appear to be architecturally similar to TBL's Solid concept.
Synereo uses some form of node-to-node process calculi model which is afaik eventually consistent; whereas, a blockchain provides deterministic global consistency. Note however, I have been working on an improvement to Satoshi's design which allows for some indeterminism in the timing of global consistency from the standpoint of validation, which was very important for fixing the scaling problem while retaining decentralization that for example Steem's (Graphene) DPoS forsakes.
The advantage of the blockchain model is that there is a global consistency that is immutable and provides certain guarantees. The Solid model is only locally consistent and eventually globally consistency with probabilistic outcomes. The latter is more resilient to censorship and centralized attack.