BeKnown comes from Monster, so if you have a profile on the Monster network, you can seamlessly import it to Facebook. If you don't, BeKnown will build your profile from whatever relevant information you included on your Facebook profile.
If you haven't shared much there, you must manually input résumé-type data just as you probably have on LinkedIn. Admittedly, this can be tiresome.
BeKnown puts friends in your network only if you specifically choose them and only if they agree to connect with you. In these ways, it doesn't feel as slick as BranchOut, yet many Facebook users like it all the same.