In my work as a minister, I hear about plenty of people who are being threatened and abused on their FB feeds by people who don’t agree with their views on politics. I usually suggest those people simply close their FB accounts and not look back. The old slogan, “if you’re not paying for the product, you ARE the product” is as true as ever.
FB sells engagement. It doesn’t have to be, and increasingly is not, positive engagement. Every time somebody has to deal with an attack on FB, they spend a little more time connected, and Zuckerberg gets a little richer.
Is FB a force for good? No. Will FB become recognized as a force against good? They might if they don’t turn down the greed.