Make sure you are not in Qatar or other network,that's the way people can see your information even if they know you or not.Dont post personal information like phone numbers,compound,etc... if you have posted pictures of your car make sure as well the licesense is not visible.But the basic thing to do is not to be in any network.I did the same when I had request from some locals,making comments in my pictures and sending me friends requests...I was in qatar net but when I found out about the nets,I changed my status to the NONE network,and now only friends and family can get to my profile.