The "like" button on Facebook speaks to our secret desire to be positive.

Maybe we don't often think about it, but Facebook functions not only as a constant source of stimuli throughout the day, but as one of positive sentiment as well. The ubiquitous “like” button, that little thumbs-up click that symbolizes support and shared feeling, is delivered to us by our friends in mini-doses throughout the day.

In her column for Salon.com, Mary Elizabeth Williams, author of Gimme Shelter: My Three Years Searching for the American Dream, details the interesting way the we've become addicted to this instant reassurance.

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