An anonymous reader writes "ZDNet's Steve O'Hear opens old wounds for Flickr veterans. 'An email dropped into my in-box yesterday from Yahoo. Titled "Flickr: Update for Old Skool members", the message went on to explain that Yahoo was discontinuing the old email-based Flickr sign-in system and that from March the 15th, all users will be required to have a Yahoo ID to sign-in to Flickr. It was one of those déjà vu moments when I thought, hang on a minute, haven't we been here before?. And of course we have.' Yahoo tried to pull this stunt almost two years ago, after it first acquired Flickr. So why open up old wounds? Yahoo say it is to make the service easier to manage as they add new features, such as localization. Many users are calling this BS, saying it's all about Yahoo marketing its other properties to Flickr's user-base. Much of the criticism is being lead by a prominent user named Thomas Hawk who also happens to be CEO of Zooomr, a direct competitor to Flickr."