thx for your answer. I can now post from a centralized account to the FB groups. I only have one issue. The post in the FB group is posted then by that account and nobody can see from which blogger this really came. My question is : If I allow the blogger to autopost to their account is it possible for them to choose to post to groups or only to their accounts?
What I mean with this is that I'm trying to find a way for the blogger to autopost to his FB group so that everybody can see who has blogged something new.