Dan, didn't you read this:
QUOTE(drew @ Dec 5 2005, 10:41 AM)

Today (December 5, 2005), I upgraded the Orchard to version 2.1.3 of the
Invision Power Board software.
...
One additional new feature is that I've configured the site to automatically post a message to the Member Bios forum when a new user registers. This way, you'll know when a new user has registered and can make them feel welcome.
While I know the intent was good, I suspect this will clutter the bio section with a lot of empty threads.
(Sorry to hijack your welcome thread, cwhartman. Welcome to the Orchard!)