Facebook and their Advertisements

On every web-page I go on I always see ADs everywhere! I recently went on facebook and so ADS anywhere where there was open space.  Many of their advertisements is student related (obviously).  For example they have advertisements about Fordham housing,  spring vacations and going abroad  to whatever country and information about colleges (school ADs).  The majority of their ADs though are businesses trying to sell you something.

I also went to check out CNN.com and to see their advertisements and to no surprise their ADs were based on things they offer on their website and on their TV channel ADs.  They had minimal non-CNN ADs.  For example, on the their health page, out all their health ADs, only one was non-CNN.  It is obvious that is company solely focuses on their business only.  

I went to check out the movie trailer of Transformer 2 at yahoo and their ADs, which I thought would revolve around movies, didn't.  There was only one AD for movies (Netflick) and the rest did not relate the movie for nothing in the world.  They had two more ADs; one was about the NutriSystem, which I found to be a not so smart place to put an AD about becoming skinny, and Trend Shine, which is part of yahoo that only talks about celebrities and the way they dress.  At least with Trend Shine it somehow relates to movies because movies features celebrities and Trend Shine is made by Yahoo.  I just wished they had more movie related ADs like the offcial website of the upcoming film, just anything movie related.