I'm writing this in the air, on my way back to New York from Ad:Tech in San Francisco, and I'm feeling... I don't know. Confused? Frustrated? It's hard to find the right adjective. Throughout the ongoing procession of meetings and conversations, both preplanned and impromptu, there seemed to be one theme, never actually mentioned outright, but rather subtly alluded to. Apparently, when it comes to online media companies, the negative connotation associated with "buying traffic" has broadened to include visitors reached through paid advertising on tier-one outlets, including Google, Bing, Facebook and others.