+------------------+        +-----------------+              +-------------------+
|                  |  yes   |                 |     no       |                   |
| is members-only? +------->+ am admin?       +------------->+ send mediated     |
|                  |        |                 |              |                   |
+--------+---------+        +--------+--------+              +-------------------+
         |                           |
         |                           |yes
         |no                         v
         |                  +--------+--------+
         |                  |                 |
         |                  | add as member   |
         |                  |                 |
         |                  +--------+--------+
         |                           |
         |                           |
         |                           v
         |                  +--------+--------+
         |                  |                 |
         +----------------->+ send directed   |
                            |                 |
                            +-----------------+