I have a basic wordpress install, running 3.8.1. I have two users, one an administrator and one an author. Each user has independently set up their facebook user accounts in Sharing. However, when the author account makes a post, publicize is posting to the administrator's Facebook account.
Interestingly, it's also posting to the administrator's twitter account, even though the author account has no twitter account connected and the publicize settings on the post do not specify a twitter account.