Has Facebook done enough to win friends in Washington? That’s the glaring question in light of the company’s recent political troubles, which has led to three congressional committees calling on Mark Zuckerberg to testify on the company’s data lapses. (Several reports on Tuesday, including from CNN and the Washington Post, indicated that Facebook and congressional staffers expect Mr. Zuckerberg to testify, possibly in April.) Meanwhile, Facebook is beefing up staffing of policy positions in its Washington, D.C., office, according to Bloomberg. The report notes Facebook has added three key lobbyists in recent months: former aides to Sen. John Kerry, Vice President Joe Biden and Sen. Mark Warner, who has been a thorn for tech companies in the past year.