With the fallout from the so-called “Motrin moms” debacle still echoing around the Web, it seems an appropriate time to highlight, once again, the perils of social media marketing. Of course, this is not the first time that a big corporation has managed to arouse the ire of the online masses, and it sure won’t be the last. But the Motrin case is notable for the swiftness and ferocity of the response, not to mention all the angry “tweets.”