Over half a century ago, management guru Peter Drucker presented the concept of the knowledge worker. Compared to the manual laborer, the knowledge worker focused on quality over quantity and worked more independently as problem solvers. Drucker said the key to improving the productivity of the knowledge worker is to allow them the freedom to innovate, learn and grow.

The knowledge worker is now the professional of today who uses Social Media and the Web to enhance his productivity, reach new customers or clients, conduct research and more. So which social network do today’s knowledge workers use?