Internet, revolutionary application of new communication technologies, presents us variations by effecting our way of communication deeper day by day. Today, widely used Web 2.0 applications have increased this variation and also have become a vital part of our daily life by especially its integration with mobile communication. Blogs express web-based publications that the possibility of personal publication, mass following of that part. The content of blogs are personally decided by the their writers and they get richer with the comments of their followers. It can be said that blog writers are opinion leaders for the society and in their blogs, time to time they may write about the product they use or the service they get and their thoughts and ideas about them. Starting from this point in this study the effective role of blogs and brands is teorically handeled bu examining examples.