Where can I find top topic groups on FB?

Question

Facebook

You need to find thematic groups with a large number of users on Facebook, how to do this? If you use a Facebook search, it gives out a couple of groups, but not all. Perhaps there is some list of groups with a convenient choice and filter?

Answer 1

Keywords for search: auto-posting in social networks, cross-posting.
Many of these services provide selection and statistics by group.