Scholars and teachers of French may enjoy following a discussion of the influence that social media are having on the tu/vous distinction in French.
First is an article in the BBC News Magazine about the use of tu in Twitter: http://www.bbc.co.uk/news/magazine-19499771
Here is a French-language response in Le Monde: http://bigbrowser.blog.lemonde.fr/2012/09/07/a-tu-et-a-toi-twitter-va-t-il-tuer-le-vouvoiement
And here is a response to that in the Guardian: http://www.guardian.co.uk/commentisfree/2012/sep/10/france-tu-vous-distinction-twitter-generation
Enjoy discussing modern usage with your colleagues and with your students!