First time accepted submitter FlameWise writes "Yesterday, German technology news site Heise changed their social 'like' buttons to a two-click format (Original in German). This will effectively disable unintentional automatic tracking of all page visits by third-party social sites like Facebook, Twitter or Google+. Less than 24 hours later over 500 websites have asked about the technology. Facebook is now threatening to blacklist Heise (Original in German)."
As I read the updated story, Facebook has backpedaled a bit, so "blacklist" may no longer be the operative word. An anonymous reader adds a quick explanation of the changed interface: "Instead of enabling Facebook to track a user (arguably without prior consent) by placing a 'like' button on the website in the usual way, a greyed-out like button is shown. If a user wants to share or 'like,' he has to execute an additional click to enable the original Facebook 'like' button and get the desired behavior. This technique obviously has a disadvantage for Facebook, because the behavioral tracking does not work anymore."