(NEWSER) – Social media may make managing friendships logistically easier, but perhaps unsurprisingly, Facebook and the like aren't actually helping you grow your circle of true friends. So reports evolutionary psychologist Robin Dunbar this month in the journal Royal Society Open Science, after analyzing research conducted in April and May of 2015 involving 3,375 people ages 18 to 65.

While women typically have larger social circles than men, the average number of Facebook friends among this sample was 150, reports CNET. But the average number of friends one can truly count on in a crisis is just four—which reflects one's offline numbers, and is remarkably consistent across backgrounds, gender, and age. Dunbar defines several friendship levels, each panning out from the four or five closest friends the average person maintains, reports the Washington Post.

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