I read that article

How the Trump-Russia Data Machine Games Google to Fool Americans

It confirms and explains in greater detail what my understanding has evolved to. Farcebook* and Google* are being used by people who know how to use it. Before Brexit it was thought to be commerce, then the extremes got so obvious - clearly political forces were pushing. But the article shows how it can be far more pervasive.

My policy is to delete any post on Farcebook that doesn't say anything about Folk music events (my raison detre) and I unfollow people when they don't tell me relevant info. I post and share Folk Music, and rarely photographed oddities. If I comment it is with humour or to remind people "Farcebook" - if they are susceptible to "drip drip" the message may get through. May!
I certainly get my NEWS elsewhere. I am not averse to doubting the BBC, but not too often.

* other anti-social media are available, the jungle is big and steamy.