Social networks 'are new e-mail'
Status updates on sites such as Facebook, Yammer, Twitter and Friendfeed are a new form of communication, the South by SouthWest Festival has heard.
"We are all in the process of creating e-mail 2.0," David Sacks, founder of business social network Yammer said.
Tens of millions of people are using social networks to stay in touch.
The growth in such services is being heralded as the start of the real-time, pervasive web.