Why did MSN messenger shut down?

Hi all, I am have been using Internet for almost a decade now and I have seen and used many applications over the years, some which will never be forgotten because of the impact they left on so many of the people. One such was the MSN Messenger, long before Facebook, we all used it and simply loved it for so many reasons. I still don't get it, why did they put it to an end? Was it because of Facebook or some other reason? Please fill me with the details
