The research, based on an analysis of 2,000 Facebook users found that mothers were able to capitalise on their wide range of contacts, including friends of their children and even their parents, to collect thousands of friends.
Tammi Williams, who conducted the study, said: "One reason is because, when you get to 45 or 50 you have not only your friends, but your children's friends, acquaintances from school and others.
"Children and teenagers tend to stick to their own age group."
The survey found that the biggest group of Facebook users is the 'Feel-Gooders' - people who enjoy the community spirit of Facebook and seeing what their friends are doing.
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And the Facebook Users With Most Friends Award goes to ... your mom. No, really, moms age 40 and older have more Facebook friends than most: