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"Nearly four out of five Internet searches happen on Google or on sites that license its technology."
-"Google vs. Evil" [wired.com] - Wired Magazine 11.01
Market share 2002 (Nielsen 2002):
Google 29%
Yahoo 29%
MSN 28%
AOL 20%
Ask Jeeves 10%
Which equates to Google results being on 78% of search pages. These figures are for page views as opposed to actual searches, so portals probably have inflated figures.
According to Media Metrix in 2001, 78% of internet users use search engines.
Combining stats from eMarketer, Neilsen and National Statistics we can glean that 47% of online shoppers use search engines as part of the shopping process; in the UK, 38% of internet users use Google; 40% of the UK is online (23.5M users)...
Therefore, 4M UK shoppers use Google!
I'm sure the margin of error is huge (the eMarketer stats date back to '98) but as a ball-park figure it's a fairly convincing case for SEO in the UK.
My guesstimate (US, 5k uniques/day) would put Google and google partners at 65%, MSN at 15%, Ask at 5%, and the rest of the 3rd-tier players fighting it out over the scraps.
[onestat.com...]
January 27 2003
1. Google....... 54.7%
2. Yahoo........ 22.1%
3. MSN Search.... 9.5%
4. AOL Search.... 3.7%
5. Terra Lycos... 2.8%
6. Altavista..... 2.5%
7. Askjeeves..... 1.5%
40.29% Google
24.2% Yahoo
17.41% MSN
6.87% AOL
2.69% AskJeeves
1.67% Netscape
1.14% Altavista
0.83% Overture
0.77% EarthLink
0.71% Lycos
0.66% Excite
0.41% Looksmart
0.41% IWon
0.28% Comcast
0.23% ATT
0.21% HotBot
0.19% C-Net
0.16% WebCrawler
0.15% CometWebSearch
0.15% AllTheWeb
0.14% Mamma
0.13% ixquick
0.09% Freeserve
0.05% Kanoodle
0.04% Teoma
0.04% About
0.01% ah-ha
0.01% ePilot
0.01% 7Search
0.01% Alexa
0.01% Profusion
0.01% Business
0% Searchalot
0% WiseNut
0% Dmoz
0% FindWhat
0% Webfile
0% GoClick
0% Pageseeker
0% NorthernLight