Joining a Genealogy Forum puts you in touch with other researchers from across the world. They are more formally arranged than Facebook groups and it is necessary to be approved to join. They are a good way to ask questions about particular areas or problems and researchers will try to help solve your problem. Some examples are:
Similar to forums are closed Facebook groups. Again it is necessary to request to join and be approved by administrators. All groups have administrators and rules for posting. Once you have been accepted, members of the group will try to solve your particular problem or you can just enjoy reading what others are saying.
Facebook is a good way to ask about particular areas or search for particular families. These groups are a great way to help others about the history of people in your locality, keep in touch with new websites, learn about unfamiliar locations or understand DNA.