...to gather their users info!
For free, of course. As one poster said, we are selling our personal data to FB and similar places...for free! I really can't blame these "social" sites for taking advantage of peoples ignorance of what they (the users) are doing or simply refusing to think about what they (the user) is doing. As has been said, "There's one born every minute! Why
not make use of their info?"
"Like" = "subscribe" = "use every thing I do for your own profit, I have no brain"
If I had a brain I would never click a "Like" button, in the first place, because FB has even told everyone what it really is...months ago.
The above is simply my biased, prejudiced opinion. And we all know what my opinions are worth! That's why FB doesn't worry that they don't have any of them.