There are companies out there that collect your information and expose it to the Internet for anyone to see. They're called data brokers, and they have names like Spokeo, Whitepages.com, PeopleFinder, as well as plenty of others. They collect data from everything you do online and then sell that data to interested parties, mostly in order to more specifically advertise to you and sell you more stuff.
Now you could search for yourself on these sites and then deal with each site individually to get your name removed. Problem is, the procedure for opting out from each site is different and sometimes involves sending faxes and filling out actual physical paperwork.
DeleteMe will efficiently handle the legwork for you and provide you an actual report.