The default behavior seems to be to assign incoming posts to the admin/owner of the site.
It would be nice to have the option to assign the posts to another user, probably on a campaign or feed basis.
For example, I'm pulling posts from a woman who writes her own recipe blog and also has an author account on my general interest site. I'd like to give her accurate credit on the incoming posts automatically, but can't. Need to edit or Quick Edit them to assign a different author.