Totally agree with The Lizard King...they have a database of people now every intelligence agency in the world would envy them for...Just look at the information you put on facebook from political affiliation to religious conviction and and....And the most important I think are the causes and groups you join that reflect who you are and who you are likely to be....
Check out this video to know what facebook is about....It is scary....just see the
terms of service you agree on when you register...