What is the new Google update – Farmer or Panda…will you suffer a traffic loss? If you are providing content that has a good level of uniqueness and don’t allow for high levels of content to be uploaded with little moderation then you should be OK.
When the Panda update occurs in the UK there could be some more drastic fall out. In the US, these sites got hit when the new algorithm hit:
Another area to note is product pages – if you have poor quality product pages with duplicate descriptions then you could get it. A tip I have seen is to make sure you have user generated content (moderated of course) on these product pages which will always help with their uniqueness.