for web promotion & online marketing 4 things are important which can be free also yes . this is the main source of web traffic if you leave serach engine on one side... cause no one wants to depend on serach engine only. marketing through blogs forums link directory benefits directory services. shiva webmaster.
He means that there are 3 major search engines, and they supply traffic. But it is scary to rely on search engines, so maybe we should actively find other methods to generate traffic. There are four methods that he is wanting to discuss marketing through blogs forums link directories directory services