Our inviter works with JS as well as Community Builder. We'll investigate creating one specific to JomSocial if time permits, but we're also working on a framework for adding more modules and features from FB to your JS site. If time permits, we'll investigate farther, but for now, I think our projects will be somewhat separate and unfortunately, user's will have to choose a fully-integrated (and free) solution, or one has easy upgrade options (JFBCInvite, comments module, and more coming soon).