Tech companies manipulating voters is not new news. This has been going on for a while. Undoubtedly it is getting worse and is a threat to democracy, but it's far from being a left-wing conspiracy. It's more pro-right-wing if anything. Take the Cambridge Analytica scandal for example. Here's a couple of links from the UK:

https://www.theguardian.com/news/2018/mar/17/cambridge-analytica-facebook-influence-us-election
https://www.theguardian.com/news/2018/mar/17/data-war-whistleblower-christopher-wylie-faceook-nix-bannon-trump