Last week Google introduced an update to its index which would try and remove low quality sites from the top of its results. There was a heavy focus in targeting content-farms which syndicated much of their content from other sites via RSS feeds as well as sites which were generally not useful to searchers. A company called Sistrix did an excellent job trying to quantify the results of Google’s update via its ‘visibility index’. Their visibility index is an index value calculated from traffic on keywords, ranking and click-through rate on specific positions. After crunching over a million keywords, the top losers based on Sistrix’s research turned out to be the following sites:
| # | Domain | Change in Visibility Index |
| 1 | wisegeek.com | -77% |
| 2 | ezinearticles.com | -90% |
| 3 | suite101.com | -94% |
| 4 | hubpages.com | -87% |
| 5 | buzzle.com | -85% |
| 6 | associatedcontent.com | -93% |
| 7 | freedownloadscenter.com | -90% |
| 8 | essortment.com | -91% |
| 9 | fixya.com | -80% |
| 10 | americantowns.com | -91% |
| 11 | lovetoknow.com | -83% |
| 12 | articlesbase.com | -94% |
| 13 | howtodothings.com | -84% |
| 14 | mahalo.com | -84% |
| 15 | business.com | -93% |
| 16 | doityourself.com | -77% |
| 17 | merchantcircle.com | -85% |
| 18 | thefind.com | -83% |
| 19 | findarticles.com | -90% |
| 20 | faqs.org | -91% |
| 21 | tradekey.com | -89% |
| 22 | answerbag.com | -91% |
| 23 | trails.com | -87% |
| 24 | examiner.com | -79% |
| 25 | allbusiness.com | -88% |
