tracing people and footprints

hello guys can u please suggest me tools which i can use to trace all the sites a speific person..whorush.com doesnt work all time aqnd sometimes when i enter the domain name it shows me no google adsense and analytics id found in some cases not all

that day i saw someone was able to detect all the domains of a particular person just by a simple image the person had uploaded..which tools u use for checking footprints of site owners.plz help me guys

found another one blekko tell me some more plz

I don't know of any one and i have been wanting to ask the same thing here. How well does blekko work?