@WalmartLabs has acquired Adchemy, the slightly mysterious Foster City, Calif., adtech company that specializes in “semantic search.”  In a related Wall Street Journal article, for the first time in a decade, Wal-MartWMT +1.04%’s Web sales grew faster than Amazon’s.  Global Internet sales at Wal-Mart, which remained ranked as the fourth largest online seller by Internet Retailer, […]