Many methods. I actually get asked for help from very experienced web masters and other online business or independent people to find things they can not locate. I am very, very good with fact checking. I am very good with dates and when things happened, mainly because many people try to take credit for my exercises of work so having online records of times I released certain things are still ghost in the machine I can find. Reverse imaging is one method but Tin Eye does all that for you.