In the iPad user guide it says you can share a video you are watching by touching this envelope looking icon.
When I load up videos using the YouTube Icon on the 1st home screen, I don't see an envelope looking icon anywhere on the screen. In fact, I can't seem to find any way to share videos when I'm using the YouTube app.
I've only had the iPad for a few days, and never an iPhone or and iPod, or iPod touch, so I'm really a green iUser. I did have an iMac though, and now have an eMac, but, it's not my main computer.