FB: Rules, publish on behalf of node autor

Hello,

Since a few days we have a workflow in place, this means that if they check the box "publish on facebook' it gets published after they click on the dialog, which is ok if we dident have a workflow in place. Most of the articles are still offline and its not nice to have there urls already on the net.. I did like to have the following option:

IF workflow state has changed to published

DO: publish the node on the authors stream, if there account is connected.

In short: when the node gets a certain workflow status, i want the node to be published on the stream of the node author, on the condition that there account is connected.

I think you can do the most with the rules module, its just that i need the code for the rules module( php input field).

i hope somebody can put me on the right track :)