What if you're using a social networking site where you can't post a standard, embedded video? Don't worry, you can still share your video. That's why there is a Share button. The Share button is also only visible on a video's watch page. If you see a link that says " View comments, related videos, and more " below that video, click on it, and that will take you to the watch page.
When do you use Share instead of <Embed>? If you have no access to pasting source code, such as social networking sites, discussion boards, and microblogging services like Twitter, using the Embed button will be worthless. You should press the Share button instead.
As soon as you press the Share button, you'll have the exact URL of the YouTube video. If that's all you need, just copy and paste it. Otherwise, let's go to the next step and share.