After a wildly successful IPO last week, Twitter is the talk of the town with a market valuation to match. We know all about the hashtags, celebrity endorsements, and the infamous fail whale, but what about the ad system they are creating? Should PPC practitioners focus on Twitter as an emerging ad channel that can drive direct response metrics, much like Facebook has evolved into? Or is the value of Twitter advertising largely brand in nature? Or maybe it's somewhere in between. Continue Reading