I think it is Activisions Servers because CoD 4 is experiiencing the same issue, haven't tryed MW2 or W@W, but I know MW3 is still up and running.
Idk what is going on, maybe it has something to do with Hurricane Sandy and the power outages.
This might have something to do with Sandy.
There's a lot of data centers in that area
I dont know but i wish they would fix it. it's on defcon 4 right now, was on defcon 5 early this morning. wish they would hurry up there are a ton of us that want to play black ops. you can play campaign and a lan party but thats it.