Hey Alessio,
Thanks for the question. I’m afraid that the plugin only works with pages and not groups or profiles. The reason for this is that Facebook’s group and profile data is not publicly accessible, meaning that you have to be logged into Facebook in order to view them. This means that the plugin can’t access the feed data in order to display it.
The only way around this would be to force every user to log into Facebook before being able to view the feed on your website, which isn’t desirable. Therefore the plugin has been designed to only work with public Facebook pages.
If you have any other questions then just let me know.