You’ve probably never heard of this creepy genealogy site. But it knows a lot about you: Familytreenow.com --- The Washington Post
There are many “people search” sites and data brokers out there, like Spokeo, or Intelius, that also know a lot about you. This is not news, at least for the Internet-literate. And the information on FamilyTreeNow comes largely from the public records and other legally accessible sources that those other data brokers use. What makes FamilyTreeNow stand out on the creepy scale, though, is how easy the site makes it for anyone to access that information all at once, and free.
Profiles on FamilyTreeNow include the age, birth month, family members, addresses and phone numbers for individuals in their system, if they have them. It also guesses at their “possible associates,” all on a publicly accessible, permalink-able page. It’s possible to opt out, but it’s not clear whether doing so actually removes you from their records or (more likely) simply hides your record so it’s no longer accessible to the public.
On the same shelf :
If you live in North America, there are lots of sites like this. For example, whitepages.com (whitepages.ca), peekyou.com, truthfinder.com, spokeo.com, etc.