Its just like tr.im or tinyurl which are very famous .
You need to use AutoShare to link up your YouTube account to social networks like Twitter and Google Reader. Then, whenever you favorite a video on YouTube, for example, that action will get syndicated out to your network, who will see this shortened edition of the video's URL.
To use youtu.be manually, simply take a URL like
and replace the
"http://www.youtube.com/watch?v=" with "http://youtu.be/"
Plug that shorter URL into a browser, and you'll see it redirects to that video.
Thats now a better service but still, the link shrinked does not become so small , because its still hard to remember link because the url cannot be selected and is automatically generated while uploading video , and not almost like url shortening services like List of all url shortners and similarly of googles own Goo.gl