Brands now have about 76 million reasons to get their social media houses in order. Millennials – those born from around 1980 to 2000 – are making social commerce a reality, according to a new report from the University of Massachusetts Dartmouth. The study looked at the social habits of Gen Y and Facebook, Twitter and Pinterest, as they relate to brands and buying. One big find might not actually come as news to some savvy e-commerce marketers: Pinterest is a retail gold mine. While Facebook is where millennials go to interact with brands online (62% of millennials surveyed said