this works with organic if surfer isnt logged in his google account.
if he is logged in then the query gets encrypted means we wont be able to know it.
you can check stats of extremetracking of any sites, it can detect the not logged in users query ,
its very easy.
get referrrer url find the pattern and catch the query then store it in either cookie or a session variable, and on signup page echo.....buahahaha
good luck.,
theres this function too for stripping queries from all major search engines referer url.
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