A new study found that 85 percent of malware is being distributed through Web applications, which is creating a growing threat for corporations as employees increasingly do online social networking, video watching, and personal e-mail at work.
Other findings of the survey, conducted by security firm Webroot, are:
Web-borne malware increased more than 500 percent in 2007.
One-quarter of companies report that data has been compromised by a Web-based threat.
Nearly one-third say their Web security was compromised as a result of employees using computers at work to access social networks, Web-based e-mail, and video sites.
15 percent enforce Internet usage policies.
About 650 information technology administrators in English-speaking countries were surveyed this summer for the study.