Using big data and propaganda to nudge elections was already well enough known to be a minor plot thread in House of Cards a few years ago. The one thing I find lacking in discussing anything like this is that the articles are always written from one side. You can say that this article is about Mercer, so it should only focus on his activities, but it's really about controlling influence in conservative politics, when this is all being done in the presence of George Soros. There was enormous detail in the article. I'd rather read half that detail, and then look at the activities from the liberal side, and compare and contrast. To me, the interesting part isn't that one side or the other is doing these things; it's what BOTH sides are doing to US.