A potential issue with some of these services is that they require users to divulge personal information, such as their age, job, and gender, which help advertisers reach the kind of people they want. As Internet-based services become part of the regular activity of computer users, the risk of unwanted intrusion increases, privacy advocates say. One programme, Comet Cursor, brought up decorative mouse cursors when users went to different Web pages. The programme drew criticism by privacy activists for the way it counted computer visits to sites featuring the software. Comet has denied tying this data to individual users for tracking purposes.
Privacy is a major issue.
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