Just some note to all this. As the name of the metrics PAGE RANK suggests, it refers to a rank of a single page. It means, every unique URL has a page rank. Now, when they say "high pr profiles", they mean to register an account on a site, which domain (home URL) has high PR. Although, when you sign up, you will get a unique URL to your profile (ie. <highpr_site>\your_profile) where you can place your link pointing to your site. Since it's going to be a brand new URL, it will have a page rank of -1. Therefore the expression HIGH PR PROFILE is misleading IMHO.