I have now asked for help a few times, so I figured I should contribute with what I can offer as of right now, which is many valuable sites if you need to look someone up.
So, all of these sites that I have collected a while back throughout a couple of hours, will help you find details on that one person you need to lookup. It can be their full name, number, zip code, criminal record, background check, and so on. These sites can be used for good, if a person seems suscpicious to you, then you can look him up. Of course this can also be used to obtain sensitive information about an individual which can then be put together into a DoX.
Hope you will enjoy these, and remember that probably about 90% of these sites only have databases within the US, so if you need to find information about someone outside the US, they wont be to much use.
I have planty more sites, but I didn't want to give everything to you on a plate, besides theres a lot to go with here.
Remember to use Google, Yahoo, Aol, Bing. They are the biggest search engines, which is your key to finding more information. You can always use advanced search querys as well.
Please don't misuse these sites, as they do contain sensitive information that can cause harm on that person. I only provide these sites for educational purposes, I don't support misuse of these sites.