One would think that few ads could be less controversial than ads for painkillers, but over the weekend, McNeil Consumer Healthcare, the maker of Motrin , found itself in the middle of a major controversy on Twitter , FriendFeed , and other social networks. Motrin's latest ad discusses the advantages of using the painkiller for mothers who 'wear' their babies close to their body with a sling or other baby carriers and who might suffer from back pain because of it. A lot of mothers (and fathers)   read more »