As far as I know there is no extension available to do that.
I remember a plugin that can push messages to facebook, SimiusPush. Thats the other way around, but it should be depending on the same API. Google it as I can't find it in the repository.
The good news is: It's fairly easy to do that using the facebook API.
The php SDK can be found here:
And an official facebook documentation there:
For a tutorial ask google. There are plenty of them.
BUT be careful. Tell your client that facebook, twitter, etc are changing their API every once in a while and sooner or later you have to do some additional work (and charge for it
) to keep up with new "features".
I'm head over heals in a project and already behind with MODX related community stuff. If it is not very urgent, I can send you some snippets I wrote about a year ago in about two weeks. I don't want to give them away as they are right now, but If I find the time to clean up some stuff, I'll gladly give he away.
[ed. note: pepebe last edited this post 5 years ago.]