I use to use eBuddy on my old N95 which lets me sign in to msn and facebook and can chat with friends on both (as well as google aol etc). But ever since getting my storm I have been waiting for them to support the storm.
Every time I check the Storm has not been added to the list, so i decided to select a different phone instead. Under BB it has "generic" so i tried it.
It is not made for the storm so its a tad fiddley but it does work perfectly.
So if you have been looking for a way to chat/IM with facebook friends then this will tie you over till something proper comes out.
search "get ebuddy" from your BB and it should come up first. then select Blackberry then Generic. You will have to create an eBuddy ID and then sign in with that and once in you can add msn/facebook/google etc.