If you want to share picture on Twitter then you use Twitpic but
when you want to share a video on youtube what shall you do?

The answer of my question is Vidtweet. The service by developer Kevin Sherman.

From Vidtweet you can share your videos with your followers.You just have to do is copy and paste the Youtube video URL in the box given along with your username. You will get a new link.Just tweet the link and see the magic.

The service supports three video services ,i.e. Youtube ,Vimeo and Dailymotion. It means you can paste the URL of any of the three services.