Almost forgot about this thread! Anyways, could it be a possibility that you have a section dedicated to YouTube Collaboration? Much like you have "TubeBuddy Board" and "YouTube Board" (maybe as a sub under YouTube?) have a section where you can add:
YouTube Board
Collaboration (other than just a normal Thread)
Vid4Vid
Shoutout4Shoutout
Box4Box
Comment4Comment
Etc.
PROS:
- Engage Users
- Promote Forum Usage / Activity
CONS:
- May Clutter Forum
- May Promote Spam
Like said, you could take the idea as a bad or good one! Regardless, thanks for reading!