I was browsing the web and just read this article from Telegraph news portal. Therefore, are we being watched?

Networking site cashes in on friends
Facebook founder finally finds a way to profit from its 150m members’ private data

Facebook is planning to exploit the vast amount of personal information it holds on its 150m members by creating one of the world’s largest market research databases.

In an attempt to finally monetise the social networking site, once valued at $15bn (£10.4bn), it will soon allow multinational companies to selectively target its members in order to research the appeal of new products. Companies will be able to pose questions to specially selected members based on such intimate details as whether they are single or married and even whether they are gay or straight.

Marketing experts have said the vast amount of personal information Facebook holds, together with the loyalty of its users, could be worth “untold millions” to companies engaged in market research.

(Excerpts from the Telegraph,  read more)

And another, if the database they’re gathering is true: