Where's This Cookie Coming From?!

Greetings,

You didn't say that you deleted all your cookies, so unless you do, that and other cookies will remain where they are. If you deleted your cookies and that one keeps coming back, then it would seem that maybe your cookies file is corrupted.

Here's what you can do:

1. Check to see that you haven't bookmarked any sites that were previously Top Sites; if so, remove those bookmarks, then quit Safari.
2. Go to Home/Library/Cookies and delete the Cookies.plist file.
3. Restart Safari and see if that cookie still shows up without you going to any web site. If not, then it would seem that your problem is solved.

Almost certainly this advertising site has given your system flash cookies. Perhaps these are influencing the re-population of your regular cookies?

Use Flush to view and delete your flash cookies.
http://machacks.tv/2009/01/27/flushapp-flash-cookie-removal-tool-for-os-x/

Just to add to Doz's good advice:

From this website:

http://machacks.tv/2009/01/27/flushapp-flash-cookie-removal-tool-for-os-x/

For those who do not know about Flash cookies, more properly referred to as Local Shared Objects (LSO), they operate in a similar way to regular browser cookies but are stored outside the purview of your browser, meaning you cannot delete them from within your browser, whether Safari, Firefox, Opera or any other. Typically they are issued from sites or 3rd party sites that contain Adobe Flash content. Since virtually all internet advertising is delivered in Flash, Google/Doudleclick and all other internet advertising companies are sure to be tracking your browsing behavior with Flash cookies. These companies can see you traverse the Internet as you come upon the plethora of sites that contain their embedded advertising. Check out the Wikipedia entry here.

In Mac OS X they are stored in the following location:
/User’s Home Folder/Library/Preferences/Macromedia/Flash Player/#SharedObjects

The settings for the Flash cookies are stored in:
/User’s Home Folder/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer/sys

In OS X Local Shared Objects, or Flash Cookies, are appended with a .sol suffix. Flush deletes the Flash cookies (.sol) and their settings.

Flush can be downloaded from that page.

This article covers the issue in more depth:

http://www.wired.com/epicenter/2009/08/you-deleted-your-cookies-think-again/

nice one Klaus1

more info -

Flash cookies are discussed in this piece on wired.com:
http://www.wired.com/epicenter/2009/08/you-deleted-your-cookies-think-again/

and lifehacker:
http://lifehacker.com/5334984/web-sites-using-flash-instead-of-browser-cookies-t o-track-your-activity

To learn more about flash cookies check out the wikipedia entry:
http://en.wikipedia.org/wiki/LocalSharedObject