If you're an avid Flickr (s yhoo) user who prefers to connect via a Google (s goog) or Facebook (s fb) account, your days are officially numbered. Following through on an announcement made in March, Yahoo will strip Flickr of both Google and Facebook login options. Existing users will have to transfer their accounts by June 30, and new users to Flickr are already not allowed to sign up with either third-party log-in.