Search/Crawl facebook group

I am rather new to DA so bear with me if my question is naive.
Is there a way to get results from Facebook group posts?
I managed to create a working plugin for the Facebook group I am interested in searching for, but the plugin does not retrieve anything: the log just shows the one page for the group search results page:
Ultimately my goal would be to have some plugin/search set that would search an assortment of Facebook groups and maybe some other social platforms for results for my search query.
Looking forward to reading your feedback!

This page requires JavaScript, a simple plugin therefore doesn’t work unfortunately. It might be nonetheless possible to write a plugin but this isn’t an easy task so far as this requires analyzing of the requests of this page and the returned responses and whether any requests return XML/JSON responses containing the results.