A friend just asked me to join a community Facebook group in Panama that he was blocked from to see what the same admin said about him. It is very libelous and he is considering legal action. I'm not an expert but the "admin" is actually another private group with one member. You would have to join to find out who it is and obviously that won't happen. It strikes me this is probably breaking FB community rules? But it also seems technically possible to do so does than mean allowed?