World Wide Web brought the Internet to the masses, the most successful companies have been those that collect information about users and use it to sell things. Google, has confirmed that it keeps track of search queries .
Companies are loath to talk about what information they track, but internal compliance manuals for law enforcement for Facebook, Yahoo and Microsoft show that their data collection is much more extensive than users might believe based on what they themselves can access.
Facebook's data collection is among the most detailed. For every user id, Facebook keeps a log of the IP address that accessed the account, the date and time, and what exactly the user did -- clicking on an advertisement, looking at someone else's profile, posting a photo or sending a message to a friend, etc