Just days after the Sikh temple shooting in Wisconsin by a white supremacist, Girls creator Lena Dunham made an insensitive joke. The offensive picture and caption is below.

Lena's scarf resembled a hijab. When fans on Twitter lashed out, she responded with the following messages:

"Been in production and completely not reading the news. Didn't realize what a bad time it was to make a joke like that. Not a good excuse you guys, but an excuse nonetheless. I'm glad you keep me informed and I'm deleting those tweets."

"Will spend tonight reading my pile of old NY Times, contemplating the boundaries of humor. I try and learn something new every day."

Lena then threw Kristen Stewart under the bus, saying: "You SHOULD apologize if you make a mistake! I mean, not to the K Stew level, but . . ."

And that's what's wrong with Twitter. It's a social networking site that thrives on its users being impulsive, not spending their time researching anything or thinking about who may be offended by their posts.