I think I'll go crazy if I have to manage one more social media tool :) Unfortunately the world we live in (at least the business world) requires us to be accessible via multiple devices, protocol, messengers and time machines. (OK maybe not time machines). Instant messaging has become almost impossible to maintain unless you have about 10 different networks running at the same time.
Then imo.im came out a while ago and seemed a little limited, at least compared to meebo.com. It has since blossomed into a very useful tool however and now thankfully I can manage all my instant message accounts in one place - AIM, MSN, Yahoo, Google Talk, Jabber, MySpace and more including the ability to group chat and make calls in Skype! More and more I find I'm using Skype as a chat tool and so being able to integrate ALL messenger applications AND Skype makes Life a lot easier :).
I even ran into a little bug that somehow caused my AIM friends to appear offline when they were online - I dropped the support team a quick note and BOOM! they fixed it (I'm guessing specifically for my username as they requested I let them know what it was). They have a very cool iphone app now too allowing me to have separate messenger applications running on phone and desktop - useful if for example I use one primarily for work and the other for fun.
Kudos to imo.im - Multiple IM problems solved!