What you can do is run different browsers with different personas. Like having Firefox, Opera and Chrome all logged in as different profiles.
You can also run say a browser like Chrome with multiple different profiles. If you set up a desktop shortcut it will log you in as a different person. A different person with a different Facebook profile, email address etc.
I use Opera for all my cherryzips stuff. Just in case someone vanilla uses the machine and browses. I don't want to alarm them. All my browsers start off where I last was. It may take a bit of explaining if they do start Opera.
