Being a member of the Facebook founder’s family won’t protect you from having your privacy breached on the social network. On Tuesday night, Randi Zuckerberg — older sister to Facebook’s CEO — posted a photo from a family gathering to Facebook (of course), showing her sisters using Facebook’s new Snapchat-esque ’Poke’ app on their phones, with Mark Zuckerberg watching with a confused look on his face. It popped up on the Facebook newsfeed of mediaite Callie Schweitzer who subscribes to Zuckerberg. Assuming the photo was a public one, Schweitzer tweeted it to her nearly 40,000 Twitter followers. Zuckerberg was not pleased.