8. Gawker Media Password Breach
Online publisher Gawker Media, which runs Gawker, Gizmodo and a number of other popular websites, suffered a data security breach in 2010 that exposed the account credentials of 1.3 million users of its commenting system. The Gawker passwords were encrypted, as well as both hashed and salted, according to the company. The company said the attack exposed the source code to the company's blogging platform and IM chat logs between employees. The attack was believed to be carried out by Gnosis, a hacktivist group loosely tied to Anonymous.