[BrianG]

Just playing around on the net, you can find all sorts of info. Some things are public records (property assessor records, telephone, address, etc); some take a little more digging (white pages, facebook, forum profiles, etc). But it's all out there, and this spokeo site is just a place that has already done the digging and is willing to sell the data to cover their research.

BTW: Some of the info on that site is correct, some used to be correct, and some is totally off base.