I use a dedicated virtual machine for Facebook. I have another for Linkedin, and a third for Gmail. I run noscript and ghostery in Firefox, on my normal desktop. I revoke temporary permissions after I am done with the webpage.
The VM's pretty much eliminate cross site tracking where I have explicitly identified myself. The Firefox addons reduce the amount of tracking from ordinary sites.
I also am cautious with regard to linking my smartphone to sites like Facebook.
