Study lists the reasons why you're friended or unfriended on Facebook

So why did that random person add you as a friend on Facebook?  Or worse yet, what possible reason could that guy who's been your friend for months just remove you from his friend list without the blink of an eye?  It's a time nobody cares about tough time for anyone to be de-friended, which William Shatner has helped the world through.  But the question still stands: why?  Thats what NM Incite has answered in newly conducted research.