Indicators on Facebook: Facebook Groups - GCFLearnFree.org You Should Know
The smart Trick of Facebook adds 'expert' feature to groups - BBC News That Nobody is Discussing

Is it recommended to join and publish in several Facebook groups? It depends, I advise posting in groups that are in your niche and will enable you to communicate with your target market. If you publish in 300 groups and they have absolutely nothing to do with your niche, your post will not bring any value to you or your audience.
These are groups where I normally publish and have higher portions of Engagement. Some have thousands of members and others less however as you can see the level of quality is not measured by the number of users, however their interactions. The ranking is random but I try to put the ones I get better engagement on the top of the list.
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If you are producing a Facebook group, your primary objective would be to get exposure and have your target audience sign up with. If this is what you desire you need to do the following things: Use the keywords in the group name. Eg: Neighborhood Supervisor, Social Media, blog writer, blog, etc; Do not utilize a very long group name 2-5 words is excellent Usage your keywords in the beginning of group name Make the name appealing and easy to keep in mind 8 Tips to be successful in Facebook groups Constantly read the guidelines of each group It is very important to read the rules.

Facebook Groups Are Destroying America - WIRED"/>Facebook: Facebook Groups
2. Introduce yourself to the group Most individuals sign up with groups and just start publishing links to their site. If you desire to stand apart and have your brand stand out, your first post should be an introduction to the group explaining who your are and what you do. 3. Post in small amounts Another problem of Facebook groups is that lots of people enter, post and leaves.

Facebook will start surfacing some public group discussions in News Feeds and search results - The Verge
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Please do not be spam, This can really injure your reliability and your Brand name. 4. Share quality material If you share quality content you will build your authority for you and your brand. If other users view your posts and discover them fascinating, you will see how the engagement with your content grows quickly.