I found the biggest secret of Google algorithm change, that may influence all you guys. I found the secret is Goolge do not only rely on backlink to rank a webpage. I found google recently rank webpage in 70% based on bounce rate of chrome and android. I found google use his other tool free fro people to use in order to steal everybody's private information, especially, by collecting end user's private information from chrome browser and android system to know whether a webpage is welcome or not, if people bounce rate is low, and stay longer time, then google will rank it high, especially for search a keywords on google.com and click enter and bounce rate etc. chrome browser occupy more than 50% of market, and android occupy more than 80% of market. So google totally do not need still rely on backlink to rank a web anymore. in 5 years ago, google may 10% rely on chrome and other free tool. nowadays, it up to 70%, and in very soon, it will 100%, and totally abandon backlink way to rank web. that means all SEO tools will are becoming useless including scrapbox, gsa, fcs, xrumer, zennoposter etc. that's why can explain SMTP and Email marketing so popular here, because they found all SEO tools are useless nowadays!!! it time to surrender to GOOGLE gangster!!!