LibDataBroker is used by both LDB plugins and LDB displays. It is so that if you like a plugin, you are not limited to which display you can use it on. If you wish to view LDB plugins on FuBar, a separate mod is currently needed called Broker2FuBar (located on Curse). If you wish to view FuBar plugins on an LDB display, you will need FuBar2Broker (also on Curse).
To read more about LibDataBroker, see these two links:
http://www.wowinterface.com/forums/s...ad.php?t=18338
http://github.com/tekkub/libdatabroker-1-1/wikis/home
edit: Lykofos beat me as I got my lunch and talked on the phone
