When Facebook introduced its Clear History feature in May, it expected to offer the privacy-oriented controls in the space of a few months. Well... it's going to take decidedly longer than that. The company's David Baser told Recode in an interview that Clear History will be available for testing "by spring of 2019." It's "taking longer" to implement the de-identification technology than Facebook first thought, Baser said. He pinned it on major technical hurdles that cropped up in development.