How do I show Salesforce User profile photo on force.com site

Hi, I have similar issue. How do I show Salesforce user profile photo on force.com site. If i use , it works on skuid page, but on force.com site it does not display any image.

In Force.com Sites, you do not have users, there is no authentication. Technically, all visits to a Force.com Site are treated as being performed by a “Site Guest User” associated with each site. This user does not have a Profile photo. Therefore, I am not sure what you are trying to show.