Re: Web Beacons - A threat?
Technically, by definition, any GIF image that has a hyperlink back to another site is considered a web beacon. But that example you gave should not be considered a threat (advertisements when browsing other sites).
What to be cautious of is if the web beacon was sent directly to you.
For example:
In your GMail account, you receive an email from Paypal of buyer purchasing one of your item. Paypal's logo will be a GIF image taking you back to login to your PP account if you click on it.
That image is most likely unique to you & can cause issues.
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