Russian Interference and Facebook's and Google's Monopoly

This is the best article I've read about Russian interference and the costs of Facebook's and Google's monopoly. Written by an early Facebook investor:

In my thirty-five-year career in technology investing, I have never made a bigger contribution to a company’s success than I made at Facebook. It was my proudest accomplishment. I admired Mark and Sheryl enormously.

...My familiarity with building organic engagement put me in a position to notice that something strange was going on in February 2016. The Democratic primary was getting under way in New Hampshire, and I started to notice a flood of viciously misogynistic anti-Clinton memes originating from Facebook groups supporting Bernie Sanders. I knew how to build engagement organically on Facebook. This was not organic. It appeared to be well organized, with an advertising budget. But surely the Sanders campaign wasn’t stupid enough to be pushing the memes themselves. I didn’t know what was going on, but I worried that Facebook was being used in ways that the founders did not intend.