Para.1 Considering that 51 percent of Americans over age 12 now have profiles on the social networking site compared to 8 percent just three years ago,according to new data from Edison Research,it's no wonder there are entire scientific journals devoted to the psychology of social networking,and piles of studies analyzing such sites' effects on our moods,body image,friendships,and marriages.Para.1 Considering that 51 percent of Americans over age 12 now have profiles on the social networking site compared to 8 percent just three years ago, according to new data from Edison Research, it’s no wonder there are entire scientific journals devoted to the psychology of social networking, and piles of studies analyzing such sites’ effects on our moods, body image, friendships, and marriages