Stack Overflow Security
Fun detail in this recap of a Stack Overflow security incident: the person hacking SO was also using SO to figure out how to do it.
"the attacker is clearly not overly familiar with the product so they spend time looking up Q&A on Stack Overflow on how to use and configure it. This act of looking up things (visiting questions) across the Stack Exchange Network becomes a frequent occurrence and allows us to anticipate and understand the attacker’s methodology over the coming days."