The Yankees had a combined 3.9 million Twitter followers and Facebook "likes" as of April 19, putting them comfortably ahead of all other baseball teams in a social media survey conducted by Sports Business Journal.
The Mets ranked a distant 13th at 400,777.
The survey included only teams' official sites.
The Yankees ranked third among U.S.-based franchises in the survey behind the Lakers (9.58 million) and Celtics (4.1 million). The Cowboys were the top NFL team at 2.65 million.
The soccer clubs FC Barcelona (13.54M), Real Madrid (13.26M) and Manchester United (12.16M) topped the list.
The Knicks ranked sixth in the NBA (899,000). The Rangers were 10th in the NHL (277,192) and the Islanders 28th (43,598).
The Jets (882,221) and Giants (799,873) were 10th and 12th in the NFL.