
I get the impression that most people who've already embraced Empire Avenue have all their eggs - LinkedIn, Facebook, Twitter, a blog - in the one basket that is themselves. So, all their social presence is plugged into a single identity.
Empire Avenue, assuming all people are like the above, only allows you to connect to one Twitter account, one Facebook account, etc...so, whereas I might have liked to add all six of my blogs and their respective Twitter accounts to my single Empire Avenue account, I can't.
But I think I've found a way around this limitation.