While Facebook’s rise took many by surprise, its success was little surprise to the hundreds of researchers who study social interactions in neuroscience labs across the country.
Here’s how social the brain is: the brain network that is always on in the background is a region involved in thinking about yourself and other people. This network is so ubiquitous it has been labeled the “default network.” When not doing anything else, the brain’s favorite pastime is to think about people. We actually turn this region down when we do any active processing, such as doing math. One study showed that inactivity for just two seconds switched the default network back on.