On Wednesday "Newsroom" actress Alison Pill, "accidentally" tweeted a topless photo of herself via Twitter. Pill, who posted the intimate pic for her 14,000 followers to see, quickly deleted the photo and owned up to her gaffe.

"Yep. That picture happened. Ugh," the 26-year-old tweeted. "My tech issues have now reached new heights, apparently. How a deletion turned into a tweet... Apologies. " (Given that Pill's Twitter following shot up to over 21,000, we're wondering if she's really all that sorry...)

Accidental or not, Pill's tweet is one of many social media slip-ups. From high profile politicians to overexposed celebs, here are five major Twitter boo-boos that had everyone talking.