Ancestry has a number of Message Boards which you can search for messages posts by others about particular surnames and locations
A forum for family history research in Caithness in Scotland
Rootsweb has a number of mailing lists which you can subscribe to for free, in order to receive by email any messages by others about a particular surname or location. There is also the option to browse or search the archives, for messages sent to the mailing list in the past
Rootsweb also has a number of Message Boards for a number of surnames and locations.
This forum appears to be Norwegian, but I did find some posts on one of my main surnames in England There is an option to view the English version, but it doesn’t translate everything.