@blowdart:Thanks for reply. 'Privacy' tab (in IE9 on Vista at least) does not have per zone settings, 'Security' tab does - this makes me think you wrote that from your memory and didn't go and check settings. In privacy tab there indeed is an option to block cookies - blocking first party cookies I assume means blocking cookies that are from the same domain as JavaScript and third-party cookies are those of other domains. Blocking first-party cookies in large part cripples web experience while blocking third-party cookies *somehow* does not prevent facebook comment box from acquiring login information. I realized that the web page I supplied for testing does not demonstrate the problem correctly (I originally used another post from the same blog for testing) - here is link which does work.  Bellow is an image that demonstrates the issue I am talking about: 

 

 

In blacked out areas is displayed my name under which I login to Facebook and an icon of my profile picture - I do not wish for that blog to have access to such information.