As of 24th Feb 2011, a major update by Google on how it ranks sites has affected 12% of search results and halved many sites’ visitor numbers. Named the Farmer or Panda Update it’s only affecting US Google results as I write but if you’re outside the US it is coming to you soon. Here’s how to find out if you have already been hit, are going to be and what to do about it.

Google update its algorithm in terms of:

• Too many links taking you away from the main page.
• Too many broken links.
• Too many ads.
• Lack of original content
• Expired deals & vouchers
• Most effective point is low quality content.

These points are caused to lose some websites ranking in SERPs.
According to search metrics report some losers are:

Pricedash.com (-99.7%)
Discountshoppinguk.co.uk (-99.3%)

Some top sites has gained the ranking:
Ebay.co.uk (+42.1%)
Techcrunch.com (+40.7%)