WhitePages.com briefly blocked ad networks from delivering ads to its site after some were found containing malware.

"'On Monday morning WhitePages received reports from users [about] malware in the form of a fake antivirus upsell program that we believe originated (against our terms) from a third-party advertising network serving ads on our website, in addition to other websites,' a WhitePages spokeswoman said in an e-mail late Tuesday," writes CNET News' Elinor Mills.

"A representative for the Senate's Committee on Environment and Public Works said on Tuesday that officials were looking at WhitePages.com and Drudge Report as possible sources of malware that had affected Senate computers the day before," Mills writes.

Click here to read the CNET News article.