That's a good question.

The reason why we'll use the same ID is that the admins here have to set up something special with our user id's to let us insert links into our posts without considering it spam or against the rules. Unless you're a sponsor, I don't think you're allowed to link to a site that sells stuff.

How would you guys like us to handle it so that you know who's speaking?

I'm US and female - my new partner is UK and male.
You'll probably be able to tell by how we write, but we could sign the posts so you know with something or other.