Having said that, Google has said that RankBrain also is used as an actual ranking signal, repeating that yesterday at our SMX Advanced show.For the SEO and search marketers worried about what they should do now that RankBrain has ramped up, the answer remains the same: nothing, but focus on great content. Even people at Google don’t quite understand how RankBrain does what it does, we’ve been told. Honest. But it’s ultimately designed to reward great content. So focus on that, which has always been the case with SEO, and you’re on the right track.