In general, the pagerank of a site would go down if it's in violation webmaster quality guidelines. As in the general search engines, google also use the links to determine reputation. Links to a site subsequently analyzed to determine its ranking in search results. The number and quality of the links can be decisive pagerank.
Basically, Google will lower the pagerank of a site if the pages of a site devoted to the search engines, perform tricks to improve search engine rankings, participating in link schemes (read the article on http://support.google.com/webmasters/bin/answer.py?answer=66356). Or use the programs to submit pages, check rankings, etc.. You might be able to read the webmaster quality guidelines in http://support.google.com/webmasters/bin/answer.py?hl=en&answer=35769#3, this article is very clear about how to behave on a site google. For example, we often see a site that is in the first position of the search results, but when opened, the site only displays listings sites such as search engines. We also often see on internet forums about improving the ranking of search results via the submit pages to social bookmarking sites, or get many backlinks for free (or paid) by using certain programs. In the forums, information resources have always said that the way that they offer are safe. Whereas in fact they have violated the rules of quality webmaster. So, do be reasonable on your site. Indicate the best quality of your website compared to your competitors.
Things we often encounter when visiting friends site is a spam, virus, trojan or other badware. They complained to google, about blocking the site due to badware. They are never used badware program. But if you look deeper, badware detection occurs is because you do a link exchange with a friend, while your friends site contains badware. Look specifically webmaster quality guidelines. Indeed, there is nothing wrong if you attach the links of sites your friends, but our advice is try to check the safety of the links through safe browser (https://google.com/safebrowsing/diagnostic?site=www.threelas.com). Maybe the video below is very useful for you to understand PageRank
An interesting case is about advertising to your site, and generally occurs on sites that are handled by many people. Read the following article from Matt Cutts, about complaint from a newspaper websites downgraded from seven to three. This article makes a lesson for how we select the ads to display. Certain websites will try to do some tricks like giving the label "sponsored" or "partner link" or the like on the link. However, in reality it contains the url link to linkbuyer. They offered to sell the links on some web pages based on their pagerank. Of course this has been an unusual relationship between a high pagerank sites with low pagerank sites, which occur are paid link. Learn more in the paid link how google does not like link buying and selling on http://support.google.com/webmasters/bin/answer.py?hl=en&answer=66736.
Indeed, an online business is legitimate and the right of every person. So it is not all paid links violate webmaster quality. Buying and selling links is a normal part of economy of the web when done for advertising purposes, and not for manipulation of search results. These links are purchased for advertising should be designed it for advertising. Therefore, try to do the following
- Adding rel=nofollow attribute on <a> tag
- Redirecting the links to an intermediate page that is blocked from search engines with a robots.txt file
Try to check the paid links that pass PageRank end up on your website: who put paid link, are any still up, check to see if one of your colleagues receive money from paid link without express payment. Remember, the nearest enemy could come from close relatives.
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