Social networking triggers the release of the generosity-trust chemical in our brains

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Social Networking Affects Brains Like Falling in Love:

...social networking might reduce cardiovascular risks, like heart attack and stroke, associated with lack of social support. But there's even more to our findings. "Your brain interpreted tweeting as if you were directly interacting with people you cared about or had empathy for," Zak says. "E-connection is processed in the brain like an in-person connection."