Are global comment systems a privacy concern?

Posted by Stefano Borini on Stack Overflow See other posts from Stack Overflow or by Stefano Borini
Published on 2010-05-20T06:17:14Z Indexed on 2010/05/20 6:20 UTC
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I more and more see these global login-once comment-everywhere systems on every page. I didn't do my homework of tinkering debugging and search before asking, so my question is as follows:

You login on site A and leave a comment.
Now you go on site B, which uses the same global comment system. At the bottom of the page a request form with your name and data appears for you to add a comment on B page. You don't leave any comment and browse away.

Does the global-comment provider get information about the fact that you visited page B, even if you don't leave any comment ?

I will dig into the code as soon as I have time, but in the meanwhile I would like to ask your insights on this regard.

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