Why did a speech video disappear?

Occasionally, you may notice that a speech link that used to work suddenly no longer does; for example, a speech video that you used to be able to watch is unavailable.  The webpage to which the link points may have been removed or moved.  The speech video could have been added by you when you added the speech or added by someone else when they added the speech to Rate Speeches.  A video becomes unavailable on the Rate Speeches website if it is no longer available from YouTube; this may be because whoever posted the video on YouTube removed the video from YouTube, or because YouTube removed the video.  Please check YouTube for specifics.