Authenticity = lovably dorky Environmental Defense staffers singing their own rendition of White Christmas.

Fauxthenticity = LonelyGirl115

Authenticity = David Sedaris paying $10 to a random audience member (a 15-year old girl in a bunny costume no less) to introduce him at a reading.

Fauxthenticity = Flogs or fake blogs, like this one that recently came to light.