Hi i was wondering if ad networks such as google, bannerconnect, and valuclick media can spit out spyware to users visiting my site? i have had a few complaints now...let me know thanks!
From what I know either A. A malicious ad slips by detection and gets into circulation of an unwitting good advertiser, or B. A malicious advertiser knowingly accepts malicious advertisements. It's probably A.
All ad networks that allow user-generated rich media banners or remote iframes may occasionally distribute some badware. Even AdSense.