Update:And another thing...

This official news post is copyrighted by Jagex. It is a direct quote from the RuneScape website.
This update was added on 17 February 2003.

In order to help us crack down on player scams, please do NOT accept membership from anyone other than your close family.

If you do accept membership from somebody else, your account will probably be banned when we find out.

So please help us to help you- and don't accept membership from anybody else.