About private servers.

It's alright if you discuss the game even though you use one. It's alright if you talk to your friends about them. Here are things that are NOT ok though.

Do not advertise the private server you play on.
Do not beg people to join.
Do not PM random people asking them to try it.
Do not spam about them.

What are allowed:
Talking about the game even though you are playing on the private server.
Answering which server you play on when asked.
Posting WoW vids that are not advertising the server.