Valve has finally apologized for last weeks Steam Christmas disaster, explaining in a lengthy statement today that the issues stemmed from a Denial of Service attack and wound up exposing the information of around 34,000 users...in an attempt to thwart some of the attacks, Valve inadvertently caused a caching malfunction that exposed some users personal information...
http://kotaku.com/valve-says-steams-christmas-malfunction-affected-about-1750324479
http://kotaku.com/valve-says-steams-christmas-malfunction-affected-about-1750324479