It is now trendy to compare the blogroll as a social network software! As attested by this post in many to many. I was right few months ago.:

Did you ever stop to think that blogrolls are awfully similar to YASNS friends? Apparently Tribe.net did too. They just released TribeCast where bloggers and anyone else who owns a website can display their Tribes or Friends. This is a fantastic bridge of two bodies of software that are quite similar.