The Social Media Page WordPress plugin will add a list of links to your social media profiles on a page or post of your choice.
Plugin to create a users community on any WordPress blog. You will have user profiles pages, photo galleries, private messaging and much more.
Add retaggr.com functionality to your blog - image tagging of any image,and totally customizable Profile Cards.Demo and help at http://www.retaggr.com
Aleph implements profiles, paginated and customizable user lists.
Friendz implements profiles, paginated and customizable user lists, and some characteristics of social networks, like friends and sets.
Adds MyBlogLog widgets and member pages to your blog.