On a conservative news site called the NTK Network, dozens of articles blasted Google and Apple for unsavory business practices. One story called Mr. Cook hypocritical for chiding Facebook over privacy, noting that Apple also collects reams of data from users. Another played down the impact of the Russians’ use of Facebook The rash of news coverage was no accident: NTK is an affiliate of Definers, sharing offices and staff with the public relations firm in Arlington, Va. Many NTK Network stories are written by staff members at Definers or America Rising, the company’s political opposition-research arm, to attack their clients’ enemies. While the NTK Network does not have a large audience of its own, its content is frequently picked up by popular conservative outlets, including Breitbart.