Let's say I'm using my iPad and I come across a video, and click the link, watch it and decide to share it with my followers on Twitter.
Something not-so-good happens. The mobile link goes to everyone. Whether they're using a mobile device or not.
Mobile is about at the same place where we were with RSS when we realized that subscription wasn't just a matter of giving someone the URL to the RSS feed. We had to do more. Unfortunately we couldn't get everyone to swing in the same direction, so the problem was never adequately solved.
The correct answer here is to have a link on the page that goes to a shareable version of the page. I might be on the mobile version, but this will take me to the "general" or default version of the page. Then if someone comes to the page on an iPad or some other supposedly limited device, they can show them the mobile version, if they must.
This happens often enough to be something we need to fix, soon -- before it becomes an unsolvable problem.