Perhaps he is talking about paid visits. Many services offer 'hits' to your website. In order to make it easier for people to visit your site, they provide a portal to visitors. This portal rotates all of their paid sites.

If this is what he is interested in, i would stay away from it. There is no gaurentee that someone actually saw your page.. they could have just gone to watch tv and left their browser window open to rotate sites.

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