Genealogy Message Boards
When internet use first became widespread, genealogists began using online message boards to locate others who might be researching the same family lines. I have followed the Genforum on genealogy.com and the message boards on Rootsweb for a long time. Although traffic on these has slowed in recent years, enough people still log in to make the effort of checking them worthwhile. I have found relatives in Canada, Germany, and all over the United States, either through messages I have posted or by responding to those of others. You can join two different types of boards–surname or locale. Recently I learned that a couple of my relatives early in the 20th century had married into the Susag family (no message board for that name), so I posted a query on a board for Griggs Co., ND (where the marriages took place). A couple of days later, a Susag researcher sent me a Susag family tree that included my relatives!