I have a link showing up in my browser history as edpn.ebay.com but I cannot get it to delete....

I keep getting a line in my broswer history that will not go away or delete. When you click on the link it takes you nowhere, but you cannot delete it. If you do delete it then it is back within seconds. It shows up no matter what site you go to, whether it be ebay, facebook, google, etc. I would appreciate any assistance in telling me what it is and how to get rid of it. I have read articles that say it is some type of tracking cookie but they are far to technical for me, and honestly the answer I would appreciate is how to block or permanently get rid of this link.

On one side of the history page it will say:

<This page has not set a title>

Then the following is on the other side:

http://edpn.ebay.com/engagement?INIT=296206546458|8672969|711137068170232|1|10|0|2|http://us.mc317.mail.yahoo.com/mc/md.php?en=CP1252

If you actually click on the link it takes you nowhere, but it will show ebay.com in the url and you get the following:

<?xml version="1.0"?>

<result><engagement>

<![CDATA[296206546458|8672969|711137068170232|1|10|0|2|http://us.mc317.mail.yahoo.com/mc/md.php?en=CP1252]]>

</engagement></result>

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