Pinterest had the second-largest reach among the U.S. online population in 2015 with a 31 percent usage rate, but only accounts for 1.34 percent of the market share. As of the second quarter of 2015, U.S. consumers were more satisfied with Pinterest than any other social networking site, which bodes well for its growth in 2016. Another feature that is expected to bring in more users is the enhanced search options that were rolled out in 2015, which allows you to search by what is pictured in a pin.