I am not related to that particular McCorkell family although I spent most of my childhood living not far from the farm and know members of the family, I did some research on them a few years ago to see if I could make a connection to my own branch but couldn't see a connection. I think that particular branch have been living in the general area of Glendermott going back to the mid 1600s.
On the lady who had the post on FB I'll see if I can contact her and put her in touch. PM me for my email, by the way have you searched Glendermott old graveyard for records for the Mitchells there are some very old graves there going back at least to the Siege of Derry!
Joe