I am particularly interested in the Leffews and Harveys of Grainger County Tennessee. Children of Stephen Leffew; came out of Rockingham County, NC
I have found from my own experience that if you go to the Person Page for the ancestor that you want to find other researchers, look at who is make the latest changes.
You can click on the person or persons who are making changes and send them a message, as well as request to see if you are related to the researcher. Who knows you may even find a second cousin you didn't know you had.
here are also some tips: