Hey ! Is there any software / website that lets you find the biggest / best facebook groups for different niches? Using facebook search won't always work, for example, the best Gamers' community group could be named completely irrelevant, like "XYZ", so when I type "gaming group" in serp, it won't give me the result I want. Is there any catalog online that helps you finding such groups, just like there are sites that help you finding instagram influencers after hashtags for example? Thank you!