It is really easy to find niche related groups by using keywords and Facebook search. So if you are in the “make money online” niche then just enter terms that are relevant such as:
• Make money online
• Work from home
• Passive income
• Internet marketing
• Digital marketing
• Online business
• Online entrepreneur
If you are in a specific sub-niche you can identify the most relevant keywords and use these to search.
Here are some examples:
• Video marketing
• Social media marketing
• Email marketing
• SEO
• Traffic generation
• Podcasting
• Paid advertising
Using the right keywords is important here. There are a number of ways that you can create a list of keywords relevant to your niche. Using the free Google Keyword Planner is one of the easiest ways to do this.
Once you receive a list of groups look for those that have the most activity and have a large member base. If a group is closed (and a lot of them are) then you will not be able to see this. In this case you will need to request to join the group and once accepted you can then see the activity levels.