Platform A, the ad network combining Advertising.com, Tacoda, AOL, and Quigo, debuted this month in the top spot in the Ad Focus Ranking, reaching 91% of the more than 184 mln Americans online, according to comScore. Substantial gains were achieved by Adconion Media Group (up four spots to 14), PrecisionClick (up six spots to 35), and Kontera (up four spots to 36). Three entities joined the ranking this month; Turn, Inc., IACAS Network, and CNN.