doubleTwist steals users' email addresses
Preface: I use aliases for every single service I sign up for in order to track who exposed my email address if I receive spam. I use Google Apps for my primary email address (which I use for correspondence, but not services). I only use Google's authentication to sign in to Google products. I do not use it to sign into 3rd-party products, as doing so exposes my primary email address to other...