The brain is an extremely complex organ dedicated to the cross-processing of data.

I wouldn't swear that's all of it, but besides shitpost, I identified six kinds of data users can exchange: fictional art (drawings, fanfictions), data benefiting to a feeling of belonging (how the weather is, how I feel today), memes, incremential data to help people to gras the reality (iptables rules, social statistics), force struggle (shitstorms, harrassement), and self-organization.

That's not the point but we may go deeper: for the record, shitstorms like #MeToo are related to the media; and incremential data to self-organization (why are we doing what we're doing?).