Some of America's biggest retailers are embroiled in a Twitter war, with brands such as J.C. Penney, Old Navy, Gap and Neiman Marcus buying Promoted Tweets tied to keyword searches for rival Target. The move is a carryover from established search-marketing tactics, writes Christopher Heine. "Hijacking Google traffic from competitors is about as old as Santa's sled. But it's intriguing to see Twitter search emerging as a holidays retail battleground," Heine writes.

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