It is not just advertising. It is the click farms that facebook has deployed. If you have not spent money to advertise on facebook then please do not down vote.

Update 1:

Sources (Sorry, I missed them earlier) -

1. Self experience.

2. https://www.youtube.com/watch?v=oVfHeWTKjag

It is sad that Facebook is "the most influential companies in the history of the world". Targeted advertisement! just sad.

agreed, but it's then