Facebook has become a great free resource for genealogy and family history. There are thousands of Facebook groups and pages for genealogy locations, ethnic groups, and interests and these groups often have amazing shared files on Facebook. Specialty Facebook groups are often the first place you’ll hear about new resources for a surname or locale you’re researching.
Several genealogists have compiled useful Facebook group lists you can use to connect with others who are researching similar people and places.
Katherine R. Willson is a professional genealogist and public speaker from Michigan who has created the largest comprehensive list of Facebook groups and pages for the United States and English-speaking Canada. You can follow her on Facebook to receive updates of any changes or additions to her list.
Gail Dever is a professional genealogist and blogger from Canada who has created a Facebook for Canadian Genealogy list covering all of Canada. You can follow her on Facebook, Pinterest, and Twitter.
Alona Tester is a Gen Xer, genealogist, and blogger from Australia who has a list of Facebook group and pages for Australia.
FamilySearch has a wiki page where you can find and contribute to Facebook group and page listings worldwide.