Advertising your pond5 submissions

Is it against the TOS to upload a low-res version with the pond5 logo to...oh, let's say, YouTube, and link it to the Pond5 video page?

There isn't any exclusivity here so you can do what you want with your own clips. You are talking about your clips right?
Most of us have a demo reel or some clips on YouTube or Vimeo as advertising for ourselves.

Jake