I am a moderator of a New York Rangers hockey board. It is powered by this software
http://www.pd9soft.com/Default.aspx
This software allows any board member to set their preferences to either see or not see other members signatures.
Also,
I belong to a AHL hockey board which is powered by this software --->
http://www.invisionpower.com/products/board/
Any board member can set their preferences up to not see or to see the other members signatures