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While the service is a legitimate business tool, its association with high-frequency ad formats (like pop-unders) sometimes leads users to mistake it for malware.
When you see an ad with this label, it means the website owner is using the AdSpyglass script to deliver content.
No. It is a tool used by webmasters. However, if you are seeing these ads constantly across all websites, your browser may have a or adware installed that is forcing these ads into your view. How to Stop the Ads Adspyglass