How emailsherlock.com gets its info?

[sherlockmy]

http://www.emailsherlock.com/

[FaisalAbid]

Check out fullcontact.com's api if you want to be truly creeped out. All these services match you up via previous information they find.

i.e Flickr username FaisalAbid, great lets see if there is a Youtube name faisalabid that fits the same location as the flickr location, or a location gathered from somewhere else.