Over Christmas, Mark Zuckerberg's older sister Randi Zuckerberg posted a "private" photo of a family gathering on Facebook.
The photo was innocent enough, as it showed several members of the Zuckerberg family gathered in the kitchen and having a good time. Randi also tagged her relatives in the pic, including brother Mark.
But unbeknownst to Randi, the photo apparently popped up in the Facebook feed of someone named Callie Schweitzer. Schweitzer then proceeded to tweet it to 40,000 of her followers, reports Forbes. As you can imagine, the photo suddenly went viral. Randi Zuckerberg's reaction to the innocent photo going public didn't help matters either.