So how famous blogger promote their blogs? Or did they promote their name only on their blogs? I think blogs are effective, but don`t understand why.. I don`t like blogs at all...Just to gain a few backlinks from an SEO perspective.. Its a more disposable site (less effort).. So you will be getting a link from a site outside your network of sites...
Other then that, no.. If your going to put a considerable amount of effort or time in.. There is no benefit of using them instead of your own domain/site.