The New User New Threads addon creates a new topic (in a forum of your choice) each time a new user is registered.
Note: This addon is currently in beta and may contain some bugs!
Features
Choose the forum the thread should be posted in
Choose the user who posts the thread
Change the thread...
Minecraft Name Check
Check if the username given during registration is a valid Minecraft username.
Also checks for illegal characters
Features
Based off Mojang's API - 100% accuracy
Lightweight
Fully Open Source under the MIT License
Stops spam bots without the need for complex captcha...