You’ve heard the common complaint that advertisers want native ads at scale. But they also want it to reach the right people. Too often, native ads follow a “post-and-pray strategy,” The Washington Post’s Jed Hartman said. So the Post built a product that marries data with native — adapting the same article-recommendation technology that has helped the newsroom increase engagement 96 percent on the site. If this sounds familiar, it might be because the tech was inspired by Amazon, whose founder Jeff Bezos also owns the Post.