This excellent slide show demonstrates the growing importance of micro-blogging and makes a case for “social objects” rather than social networking, and then lays out 5 principles for building services around them. Engestrom argues that “sites that fail are just ’social networks’,” whereas sites that have succeeded have organized around social objects such as music, photos, favorite websites, and books. He contends that microblogging with such applications as Twitter are disruptive because they are simpler, cheaper, and only need a mobile device to work, making them also more convenient.

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