If corporate employees have a sneaking suspicion they are being watched while web browsing, their instincts would be spot on, according to survey results from Robert Half Technology.

According to the firm, more than three-quarters (78%) of some 1,400 CIOs polled by said they have either installed content filtering or blocking software, instituted policies that detail acceptable web browsing or have done a combination of both.

About 40% of CIOs polled reported combining corporate policy with software that blocks certain content from employees. Another 27% said they have a corporate policy in place the details acceptable web browsing by employees. Some 14% have software installed that limits employee access to specified sites and content and about 17% have no policies in place to limit web browsing by employees. And 4% restrict web access for employees altogether, the survey found.

The reasons behind the corporate policies and content-blocking software include preventing access to inappropriate content for 75% and preventing virus attacks and malware downloads for another 71%. More than 60% said they want to keep their employees from wasting time at work. Robert Half Technology advises companies put policies and proper education in place to prevent unacceptable web browsing by employees.

"All companies should have a corporate policy in place that outlines acceptable Web use by employees, said Katherine Spencer Lee, executive director of Robert Half Technology. "Communicating and explaining web access policies, along with the risks associated with web browsing helps employees understand why these guidelines are in place."