7) Facebook’s growth and influence have been incredible. In one survey, college students named Facebook the second on most popular thing in their undergraduate world, tied only with beer. And Facebook is not used only by undergrads. Of the 150+ million users in the United States, 29 percent are aged 35 to 54, while 25 percent are aged 18 to 24. Overall, women represent the fast growing segment. Facebook also tends to have a more upscale, educated, desirable demographic than competitive social networks, and therefore it charges more for its advertising ads.