How to Search for Niche Relevant Closed Groups on Facebook?

Hey folks, I'm looking for a software or method to search for Niche Relevant Closed Groups on Facebook. I came across a few softwares but they can only find open/public groups.

I want to grab the User IDs of the relevant closed groups so that I can target them with my ads.

Any help would be greatly appreciated.


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Save yourself the money and just join the damn closed group. When you join the closed group it will not be closed anymore. You will have the access to the members. Unless you are talking about secret groups which that is another whole story.