I don't see how BTC allows you to 'talk' to another person through it. However, when tx's are broadcasted, nodes validate these tx's and communicate it to other nodes who check if it meets the networks rules and they validate it too, the same with blocks, when a miner confirms a block, nodes validate these blocks and communicate it to one another, before adding it to the boockchain.

Now, if this is the kind of communication you are talking about, then i agree, but surely it has nothing to do with social media or social networking.