The Hub is where you can post non-Disney related items (but please do not post non-Disney pictures). The Hub aggregates ALL conversations in MouseWait and puts them into one place so you can follow all conversations easily.
Disneyland Real-Time Land: This is
ONLY for people who are at the park,
posting real-time updates
This is from the FAQ. When in the parks, and posting in Park RAKS or looking to find in park RAKS use Disneyland Real Time. The Hub moves So fast sometimes things can get overlooked.