Take a look at more detailed traffic statistics to see different referring urls. You could see from what sites you are getting less traffic and from what sites you are getting more traffic. Check if hard links and back links are still existing on those sites. Maybe those sites are getting less traffic. Maybe your links have decreased ranking, such as lower on the top list. They could have been moved to the bottom of page instead of top of page. Getting any Google, Yahoo or Bing traffic? Follow complex ranking algorithms to figure out what your place really is.
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