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"  Facebook may have no friend limit, but your brain does, according to evolutionary biology. In the book How Many Friends Does One Person Need?, British biologist Robin Dunbar explains the number of relationships we can maintain at any given time is capped at 150, Psychology Today reports. This is because of the brain&amp;#039;s neocortex size, according to Dunbar. And it&amp;#039;s about quantity, not quality: those 150 relationships your brain can process aren&amp;#039;t just those you consider bestie-level (a.k.a. your work-wife isn&amp;#039;t hoarding all your brain space when she&amp;#039;s sending you those funny GIFs and sharing her last cookie)\u2014although each relationship is &amp;quot;reciprocal and based around general obligations of trust and reciprocity,&amp;quot; says Dunbar, some are more intimate than others. He divides friendships into four layers or &amp;quot;Circles of Acquaintanceship&amp;quot; in your life. Your best friends make up the innermost circle, which is the smallest. Each successive layer can hold more people, but the level of emotional intimacy decreases the farther out you get. Science said it, but this is something we figured out when we were sending out invitations to our sixth grade birthday party. The layers and 150-cap haven&amp;#039;t changed throughout history, according to Dunbar, meaning social media hasn&amp;#039;t increased our limit, only the appearance of it. That Facebook friend purge just got a little easier. Photo: Courtesy of Fox "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.elle.com/life-love/news/a25276/friend-limit-exists/>