Who could forget former U.S. Representative Anthony Weiner, whose tweeted crotch-shot set a new standard for political pratfalls in the social media age? Then there’s actor Woody Harrelson, whose epically failed Reddit AMA spawned a derisive meme and undermined the very film he was aiming to promote.Among brands, there’s the Red Cross employee who accidentally tweeted about “#gettingslizzerd” from the charity’s official account rather than her personal one. Ragu, Nestle and Kenneth Cole have all showed some Twitter or Facebook ineptitude of their own as well.But not every high-profile gaffe has to end with embarrassment or alienated fans. Handling a blunder smoothly with humor and class can actually reflect well on a celebrity or brand, turning negative into positive. The Red Cross did just that, for example, by addressing the erroneous tweet head-on — but in a lighthearted way — and partnering with a brewery for a blood drive.