Russian efforts to meddle in American politics did not end at Facebook and Twitter. A CNN investigation of a Russian-linked account shows its tentacles extended to YouTube, Tumblr and even Pokémon Go. One Russian-linked campaign posing as part of the Black Lives Matter movement used Facebook, Instagram, Twitter, YouTube, Tumblr and Pokémon Go and even contacted some reporters in an effort to exploit racial tensions and sow discord among Americans, CNN has learned. The campaign, titled "Don't Shoot Us," offers new insights into how Russian agents created a broad online ecosystem where divisive political messages were reinforced across multiple platforms,...