Since I started using Twitter and Facebook I found my usage of IM has been decreased. I believe that social media websites has affected greatly the usage of messengers. Google did a good job to me that I don’t need to add people explicitly into Gtalk. The people to whom I ever wrote some thing are my buddies. And if I talk about MSN messenger, I fever (or can be say no) received any add buddy request. But if I see network on Facebook or Twitter, it is expanding.
People are not using IMs. And they focusing more and more on these sites and spending time on them. This is the big shift. I believe people use IMs for their official purposes. And for the entertainment and friends networking, now there are social media sites.