A site recently included in the Google is very unstable, sometimes more than 3,000, sometimes 1500, in these two digital beats, volatility is very intense. Also checked a lot of peer site, basically have such a situation occurs. Also consulted a number of masters, we are vague about their talk, they are not very sure, so summed up a number of reasons to come out and exchange with you. Reference website www.pfzxmr.com/
First, Google dance
After talking to a lot of people, most of them think it's Google dance (casually, Google Dance is the activity that Google regularly updates its index, giving people the impression that it's like dancing. In this dance process, Google's stored index has been updated, the site's ranking will be drastically changed, if the site has a large number of duplicate content or collection, will be truncated snapshot of the situation, is Google's normal update caused by changes.
Second, the website uses the space to be unstable
Site space instability, in view of the domestic record situation, a large part of the site space in foreign countries, Hong Kong's international bandwidth is only 1 m, the United States IP is often blocked, often do not open the site. Or it's too slow to open. Google's response is quite sensitive, many consecutive updates can not catch believe information, then your stand away from the database is not far away from the cleanup. Because Google thought that your station has been closed, or that the relevant page does not exist, and then removed from the index library. The next day the spider crawled again to add these URLs to the address library.
Third, the website uses the cheating technique
such as collection, keyword accumulation, and the site of a large number of duplicate content, hidden text and so on. If this happens, Google even if you have included you, do not be glad to muddle through. Because in the update time will also slowly remove. Again, such as the two level domain name and the blog cross Connection also can cause this kind of situation, this is also one of the most common reasons. The content is almost all collected, and is the collection of very popular articles. Search engines will suddenly include you in thousands of pages, but in a certain time, search engines will be retrieved, if your content is worthless and discarded.
The above is a personal "Google included when a few times" some of the views, if there is hope for the operation of the people have implications. Another article first http://www.pfzxmr.com/, reproduced please indicate the source, thank you for your cooperation.