Interesting write up at The Register discussing protections against social media tracking what websites you visit and how to stop them from tracking you. If you monitor and watch which browsers you use and what addons or extensions are used, you can avoid a lot of this tracking.
According to the article social media buttons and badges can be controlled:
Firefox offers an experimental plug-in called Share Me Not, which prevents tracking without removing the button functionality from the website.
The article also goes on about considering
TACO, Beef Taco (Firefox), and Keep My Opt Outs (Chrome), make use of permanent “opt-out” cookies to inform advertising networks that the user of this browser does not want to be tracked. Along with the various browser-specific do not track flags, these are ways of ensuring many of the most prolific advertising companies will grant you your privacy. Another terrific addon to consider for cookie handling is Privacy Block that will remove LSO cookies that embed themselves into the operating system and give you the choice to remove them when you close out your browser.
As with any computer technology, only select one tool for a specific purpose. Too many Internet Explorer extensions, Chrome extensions or Firefox Addons can lead to instability of the browsers. SO be cautious about using more than one addon or extension for each kind of privacy protection.