Internet addictions — especially to social media — have been well documented. And the truth is, we’re feeling like we might have a touch of Facebook addiction. But what’s the psychology behind this disorder? As it turns out, receiving and answering a notification results in a hit of dopamine, a chemical neurotransmitter associated with the motivation and reward response in the human brain. Dopamine is also released in high quantities when we consume drugs or have sex. Social media notifications can have the same addictive effect.