at present . they have two aspests , you can not find out some advantagese from google , and you neither find out some wrong with yahoo if you are good at logging in yahoo!
l had tried already! it is so goog one .you focus on building quality backlinks on high PR sites it is ok!
Google Ranking Factor 1. Positive ON-Page SEO Factors. 2. Negative ON-Page SEO Factors. 3. Positive OFF-Page SEO Factors. 4. Negative OFF-Page SEO Factors.