Ad Biz Wednesday Morning Stir By Kiran Aditham on Mar. 28, 2012 - 9:41 AM -Omnicom agencies TBWA\WorldHealth and CAHG have formed a strategic alliance. link -Leo Burnett and 72andSunny were among the big winners at the 4As’ 2012 O’Toole Awards. link -Pinterest is clamping down on spam. link ...