Did you know every time you see a Facebook/Twitter/Social Media-de-jour button on a web-page it's reporting your visiting patterns to home base? If you thought Ad tracking was a worrying invasion of your privacy then just consider how much info Facebook has on you along with your browsing history?
While things like incognito mode have their place I'd rather reduce the amount of information sites collect on me by default. Enter the Disconnect extension for Chrome. Simple and easy to use it offers a single click button to re-enable those buttons should you want to "Like" something.