All right. So there's the Ex-Pats in the Kingdom of Saudi Arabia facebook group, but their group is open. Details posted there are available for all to see.
I have started a new group called "Private Jeddah Expats" it is a "closed" facebook group and the details posted there, in addition to the identities of the members are completely private. This means that whatever we post there will be seen only by expat members. It is managed by me, and I will scrutinize each person who requests to join closely.