Non Personalized Search
For a surfer personalized search is a good idea: more you search - more relevant data you get. Cookies with your search history give to SE a lot of material to work with. I noticed this future last year. At home you have one result from Google (say, 5th SERP), go to other place - another result (SERP 15, for example). For those who love stability in results, use personalised search, or even on social manner Eurekster. You can work at your job and obtain relevant results every day more and more better. Perhaps, for a job thats great, but for SEO Freelancer - is simply nightmare and headache, as all you need is to know Search Engine Keyword Position! How can you determine REAL life keyword position in SE?
Personally me use anonimizers (HTTP and HTTPS anonymous proxies). They give me a fine result everywhere.
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