Hi ... When a facebook registered user write a post in the jomsocial timeline a post is generated in the facebook timeline .. but without any mention of the website where is originally posted.
so ... there is any customizing method to apply, in the FB post, the origin website? like this example
In the feed post itself, there's a line "fa tramite fotozoom". That should link to your website. If not, let us know. That's the standard way that Facebook automatically links back to your content and is what we'd recommend you stick with.