In theory, using a separate browser is not adequate protection from tracking. The Flash Player's "Shared Objects" (aka Flash cookies) are stored in a common directory, so the same Flash data is accessible from any browser running as the same user. I do not believe Facebook's tracking is this nefarious, but the method would be quite easy to implement.
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> I started putting Facebook in another browser
In theory, using a separate browser is not adequate protection from tracking. The Flash Player's "Shared Objects" (aka Flash cookies) are stored in a common directory, so the same Flash data is accessible from any browser running as the same user. I do not believe Facebook's tracking is this nefarious, but the method would be quite easy to implement.
Disable flash in the browser that runs only facebook?
I've gone a step further and disabled it across the board.
Relevant. The Evercookie.
http://samy.pl/evercookie/