you might think that you’ve never interacted with a fake person online, but you have, and with loads of them. You decided to buy something because it had a lot of good reviews, but many of those reviews were from artificial people. You found a doctor by using a search engine, but the reason that doctor showed up high in the search results was that a load of fake people linked to her office. You looked at a video or read a story because so many other people had, but most of them were fake. You became aware of tweets because they were retweeted first by armies of bots.