E-Media Tidbits points us to an article in the May 2008 Scientific American, by Jennifer Wapner (Blogging: It’s Good for You):

“Blogging may make us feel better because it acts as a substitute or placebo for real satisfaction. Or, according to one neuroscientist cited by Wapner, our limbic (primitive) brain may have an innate need to communicate — akin to our drives for food or sex. Thus, as we blog, our bodies may release the feel-good neurotransmitter dopamine.”

I feel better already.