A new survey shows that a little more than half of Americans over 18 belong to one social media site.

77.4 percent of respondents ages 18-34 used social media, and 54.8 percent belong to two or more social media sites

Only 47.5 percent of Baby Boomers (ages 45-64) are online social networkers, and just 23.3 percent belong to two or more socnet sites

Overall, women were more likely than men (56.5 percent to 50.6 percent) to belong to a social networking site.