Target's ad buyer, Stephen Dwyer, said the Valley needs to better educate buyers by sharing data. Coca-Cola's Tara Scarlett agreed and added that website owners have to explain to ad agencies who their users are and why they're valuable. Or, as two ignorant bloggers explained to David Spark at last night's Revision3 party, "Ad buyers, they're like junkies. And the people who sell advertising are like drug dealers. Facebook needs to better explain how to pack the crack pipe and smoke it."