Also quality of the content is important. Sites with own, rich and unique content are rarely damaged by Panda update.
Firstly, I would try find possible reasons.
Posts made by DELETE_b
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RE: We have Lost Ranking After Panda updateposted in Technical SEO
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What happens with Likes etc when we change site structureposted in Social Media
Hi,
we are planning to make major changes in our site (SEO optimalization) and recently I read post in some kind of blog speaking about problems with FB Likes, Tweet etc when we change URLs.
So the question is: Is it true that we lose social rankings when we change URLs structure( e.g. from http://domain.com/aaa/213/aa to http://domain.com/category/text/text), even with proper 301 redirects?