November 2018 updated.
Sheldon Family Association has a Facebook page. It is listed along with other genealogy Facebook pages in a listing I found a few days ago. I was amazed to learn there are over 32,000 facebook pages whoes focus is their families history. It is humbling to see our site is not unique on Facebook. You can look at them from the list attached below, along with the article. Click on the two links below to read the article and the second is the entire list of facebook genealogy sites.
If you are searching for a relative this list might get you to the exact state and county that has the exact info you need. Open the list above and click on a state name. It will take you to the correct page and then look for the county or city name that you desire.