Google Traffic To Wikipedia up 166% Year over Year by Hitwise’s LeeAnn Prescott gives us some of the data search marketers have been craving for years. We all knew that Wikipedia tends to rule in the Google results but these statistics show us by how much.

70% of Wikipedia’s upstream visits came from search engines
50% of the search engine visits came from Google
The percentage of Google’s downstream traffic going to Wikipedia increased by 166% year over year
Last week Wikipedia was the #3

Following the share-of-search statistics from Compete and comScore, we now have numbers from Hitwise and Nielsen/NetRatings.

Last night Bill Tancer complied an “extended” list of statistics and numbers on Google’s Properties, which shows the market share of all of Google’s properties as they compete with each other. With no surprise, Google’s search product captures the bulk of the share with over 78% share, followed by image search with slightly over 9% share and then Gmail with almost 5.5% share