I have to admit I hadn’t heard of the use of Flash cookies until recently (one of our customers enlightened me). I still haven’t found anything that looks like a GUID in any of the Flash cookies on my computer, but what I understand that is very possible to store (actually by default 100K can be stored – compared to max 4K for Internet Explorer).
The big issue is that they are very tricky to find and to get rid of. You might think that when you clear your browser’s history etc, you are safe – wrong! The Flash cookies stick, until you google around and find a page at Adobe (Settings Manager) where you can chose to Remove All Websites.
Of course you need to have Flash installed in your browser to get Flash cookies, but I guess that it’s only IPhone users that do not run Flash (yet!).
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These nasties have been around for awhile and having found the directory in which they are stored…(PC) C:\Documents and Settings\Administrator\Application Data\Macromedia
I was shocked to see that my bank uses them!! Well, thats not good and so if you use Firefox all you need to so to secure, and delete on exit is to install the addon called “Better Privacy” in which the plugin will give YOU complete control over what gets stored, where and when they get deleted.