; Since then
4, website down right. If your site is not updated snapshot, and even reverse the signs, this is usually a bad omen, explain your site optimization of a link to have problems, not timely remedy will lead to the right of the site is down
5, love Shanghai adjustment algorithm. Love Shanghai algorithm also means that the adjustment of website optimization way adjustment, each adjustment algorithm and the basic love Shanghai have caused large scale snapshot not update or even go back problems, this usually don’t worry too much about, but should pay attention to understand the new algorithm to love Shanghai and adjust their own website optimization method.