I wrote about it here!

Digiexplorer (not guru), Senior Lecturer in Digital Marketing @ Manchester Metropolitan University. Interested in digital literacy and digital cultureĀ in the third sector (especially faith). Author of ‘Raising Children in a Digital Age’, regularly checks hashtag #DigitalParenting.
See also this great post from Paul Windo: http://paulwindo.blogspot.com/2010/12/sm4sc.html