yeah...that s a key point of profile link building. The links which can be visible only after logging in are 100% waste. Make profiles and make sure that its open to public. Contribute to the site with some posts or comments ( link back to profile) It can give you more benefit..
Everybody has their own link building strategy. My blog is all about link building and SEO. I like to work on link building campaign for my blog.
Cool. What are the most working methods for you? Or I mean what are the favorite link building methods of yours?