Facebook fans tend to lurk instead of play when they tune into the social network while at their jobs, according to a report released by computer security firm Palo Alto Networks.

While many workers link to Facebook on company computers, 88 per cent of the online traffic consists of people watching what friends are up to in the online community, the report found.

Use of social games such as “FarmVille” popular at Facebook accounted for only five per cent of the traffic, while a meagre 1.4 per cent was devoted to posting updates or comments at the social network.

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