 Using Facebook Like button data , Ben Blatt of the Harvard College Sports Analysis Collective found in 2012 that Red Sox fans are east of the New York State – Vermont / Massachusetts border , and Yankees fans are west . Blatt wrote , " I had thought that it was possible that Red Sox Nation might extend into northern New York or Yankee territory might extend into Vermont . This turned out not to be the case " . Connecticut divides support between the two teams ; he found that 56 @.@ 6 % of Facebook users in Hartford , often cited as being on the border between the two teams ' fans , supported the Yankees . While Blatt found that identifying an exact border within the state was impossible , Guilford and Middletown are almost exactly divided , with 50 @.@ 7 % in each supporting the Yankees . 
