Many of these videos about the impact of social media are available.  I like the following because of the scholarship by the developers of the video (see end of video for thei organizations).  I try to implement some social media in my history course like podcasting and Twitter.  One suggestion I have for fellow educators is to ask your students what is meaningful to them and their suggestions for thoughtful use in the classroom.  Even students report social media fatigue, so be measured in its use.  Click on arrow in middle of video screen to start.