NEW YORK — Facebook “likes” can tell a lot about a person. Maybe even enough to fuel a voter-manipulation effort like the one a Trump-affiliated data-mining firm stands accused of — and which Facebook may have enabled. The social network is under fire after The New York Times and The Guardian newspaper reported that former Trump campaign consultant Cambridge Analytica used data, including user likes, inappropriately obtained from roughly 50 million Facebook users to try to influence elections. Monday was a wild roller-coaster ride for Facebook, whose shares plunged 7 percent in its worst one-day decline since 2014.