“Boston Loves Impressionism,” the MFA’s first “crowd-sourced” exhibition, opens Friday. The public was asked to vote for favorites among a group of 50 Impressionist and Post-Impressionist masterpieces in the MFA’s collection, and Vincent van Gogh’s “Houses at Auvers” earned the most votes (4,464), edging out Claude Monet, whose “Water Lilies” earned the equivalent of an Olympic silver medal. The bronze was taken by Edgar Degas’s “Little Fourteen-Year-Old Dancer,” the only sculpture in the contest. (In all, 41,497 votes were cast.) The three favorites are at the entrance of the “Boston Loves Impressionism” exhibition, which is on view through May 26.