01-25-2009, 05:13 PM
Registration is free, but you have to be a paying subscriber to view some of the information and do certain kinds of searches. That includes seeing who is searching for you. Their records are provided by others, and through searches on public databases. They started by marketing to class reunion organizers, who often got email and other addresses directly or indirectly from former class members and the same kind of public sources such as the Google archive of usenet postings.