[unicornporn]

I just run Facebook in a separate browser (Opera) to isolate the session. Yes, I'm that crazy.

I tried Multifox ( http://br.mozdev.org/multifox/ ), but for some reason I concluded it wasn't a good solution. Can't remember why though.

[gigawatt]

I do the same thing for bank accounts and such — I only use a clean install of opera, and that's all I use it for.