understanding how to autopublish from my blogs to facebook...setting it up

I'm a little confused on the , hole Facebook thing,,, but i figured out this much, i have a Facebook.. that i use, and i have a word press multi site that has about 500 blog ... and i would like to add this ultimate Facebook to each of my blogs... all my blogs a different... that i pump information to from a couple of blogs.... for my clients.. now some of my clients that i have have purchased the Facebook page and i have built them but i would like to add the feature of the auto post to these blogs... from the clients blog... to Facebook.. and i need help understanding how to make this happen..

please help so confused