There are many blogs out there, and many reasons that people write blogs. Some blogs are personal, some are news, some are commentary, and so on. There are many different reasons that people try to bring traffic to their blogs. It might be to earn money from advertising, to get more people exposed to ones viewpoints, or perhaps just another way to compete. The ways that people try to get traffic is also manifold and frequently changing.

EntreCard is one of the most notorious sites. It can drive a lot of traffic, but people question the quality of the traffic and even more significantly the ability of their management to run the site effectively.