I recently created a 4 minute video in which I briefly answer six questions on online social networking:
What are the benefits of online social networks?
How do I know if my obsession with Facebook has gone too far?
What is the etiquette for ignoring invitations on social network?
How do Australians compare with others in using online social networks?
Will email die now that all my friends keep in touch on Facebook?
What should companies think about their staff using social networks?
The video was created for an Australian audience, so for others, please draw your own implications on how your country compares on uptake of social networks. See here for recent figures on comparisons of the usage of online social networks US, UK, and Australia.