However, according to McAfee, this is a surprisingly low number as IT managers should be well aware of the security dangers posed by the use of sites such as Facebook and MySpace.

The reason many companies don't block them could well be because managers see other threats as being more prominent, as well as a reluctance to risk a drop in staff morale.

"IT decision makers often have the difficult job of making a choice between what they know are serious security threats and other business priorities such as productivity and employee morale," said Toralv Dirro of McAfee.

A report from McAfee found that 57 per cent of IT managers were concerned that social networking sites could open a network up to viruses and 54 per cent thought they encouraged spam email.

The research also found that IT managers were concerned about threats from other areas, such as music downloads, instant messaging and online dating.

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