Strange visitors to site

[Phid]

I have noticed over the past month or so that some suspicious visits are made to a particular obscure product on my site. In the past I know that this was being done to use the "tell a friend" feature for spamming purposes, so I changed it so that registration had to be done before using "tell a friend".

However, I still get visitors to that obscure page. I check the e-mail archive so I know there's no spam being sent from those visitors. However, in user tracking just today I see nine visitors from a variety of countries/IPs visiting this page within a matter of a couple of minutes. They only stay on that page and don't look at other pages.

What's the deal with these? Is there something I should be concerned about?

[Kim]

Have you looked at your server logs to see where those folks came from to get to that page?

[Phid]

They don't show an external referring url in user tracking.

[Merlinpa1969]

Its probably a robot