The Priv3 Firefox extension lets you remain logged in to the social networking sites you use and still browse the web, knowing that those third-party sites only learn where you go on the web when you want them to.
Ghostery allows you to block scripts from companies that you don’t trust, delete local shared objects, and even block images and iframes. Ghostery puts your web privacy back in your hands.
Disconnect stops major third parties and search engines from tracking the webpages you go to and searches you do
ShareMeNot is a Firefox add-on designed to prevent third-party buttons (such as the Facebook “Like” button or the Twitter “tweet” button) embedded by sites across the Internet from tracking you until you actually click on them.
German website Heise also offers a ‘two-clicks for more privacy’-solution that –when implemented- disables the social buttons (Like, tweet, plus) –an their ability to track- by default and activates them only when the user toggles them on. Sidenote: the German state of Schleswig-Holstein banned the ‘like’ button in August, fining the state institutions who kept the like button on their website.