Is You tube a very good tool for learning and teaching?

You tube is a very good tool for learning and teaching.
You tube is one of the most common tools used is classrooms. By using You tube one can provide supplementary information for classrooms. You tube helps teachers to bring the lessons to life, rather than traditional reading and listening. Also, by using YouTube, an instructor can create a more engaging and context-rich classrooms environment. Doing so, creates a more comfortable setting and encourages students to pay attention.
According to R. Mullen and L. Wedwick (2008), you tube is an easily accessible and effective tool for classroom instruction. Others however, caution that using media like YouTube are subject to certain rules and regulations that teachers must consider. (R. Talab & R. Butler, 2007)
Many school s are restricted in using you tube in classrooms. Do you think that using YouTube in classrooms has advantages/disadvantages? Please explain.

Talab, R. S. and R. P. Butler (2007). shared electronic spaces in the classroom: copyright, privacy, and guidelines. TechTrends. 51(1): pgs. 12-15.

Mullen, R. and L. Wedwick (2008). Avoiding the digital abyss: getting started in the classroom with youtube, digital stories, and blogs. Clearing House: A Journal of Educational Strategies, Issues and Ideas 82(2-), pgs. 66-69.