Join a Facebook Group – To find groups to join:
1. Tap the search button and then tap the search bar.
2. Enter some keywords for the group you’re looking for.
3. Tap the group name in the results and tap Join Group.
Depending on the group’s settings, you may have to wait for a group admin to approve your request.
If you can’t find a group you’re searching for, it may be a secret group. Secret groups won’t appear in search results, and a current member will need to invite you.
When you join a group other people may be able to see that you’re a member depending on the group’s privacy setting.
See: How to Search For Post in a Group
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