account id vs email
Installation and Configuration
So does Jamroom, but your user account is always the same, You can have 10 profiles and create profile items as them when your using that profile, but for comments, you are always you. For buying stuff, you are always you.
So profile related stuff like blog posts, or audio files or images, things that are put on a profile, that will show the profile name, but things like comments show the user.
When you are an owner of a profile and you go to that profile you are automatically changed to that profile, so you wont need to change profiles "Post As" like you do on facebook.