"We are all in the process of creating e-mail 2.0," David Sacks, founder of business social network Yammer said.

Mr Sacks said: "What people want to do on social network these days is post status updates. We think it's all people want to do."

Yammer is an enterprise social network, designed to facilitate communication within companies and organisations. It is one of a growing number of services that lets users share micro-updates. Other services have a richer mix of content, including sharing photos and video, and allowing comments from people within your social network, building a so-called activity stream.

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