<p>Yahoo CEO Marissa Mayer ruffled feathers in the photography world earlier this week when she said "there's no such thing, really, as professional photographers." Photographers thought Mayer was dissing their jobs, while the tech executive said all she meant was that updates to the basic Flickr service will give users the same kind of space and resources that professionals expect. Yet she apologized profusely and individually to the offended photographers via Twitter:</p><p>The furor seemed to die down, and her savvy response got Newsfeed thinking about other big names who have issued apologies in the Twittersphere. Here are 8 notable examples from the past year:</p><p>1. Katy Perry to Chief Keef for Bashing His Lyrics</p><p>Katy Perry sparked fireworks on May 21 when she tweeted about Chicago rapper Chief Keef's song "I Hate Being Sober," writing that she had "serious doubt for the world." Keef threatened to beat her up, tweeting, "Ill Smack The S*** out her." Perry clarified that she was making a point about binge-drinking culture, but some say Keef should have said he was sorry instead.</p><p><a href="http://newsfeed.time.com/2013/05/25/mea-culpa-best-twitter-apologies/">Keep reading...</a></p>