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how does exactly alexa tracks traffic of the site?
it never knows when i visit one site or another or is it?
i know i never installed anything from alexa, did they do it w/o my authorization? - if yes, then why would anyone base their desicion (or judgement) about a web site on alexa's rankings in the first place; if no, then how else are they able to track traffic besides having their tool on the server side, i'm sure server owners wont give such opportunity voluntarily and getting access on servers w/o authorization present more challenges then getting on clients pc. so, what is the way for the third party to masure accurately popularity of site?
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