Networking is a prime form of 21st century learning. The world is much smaller thanks to technology. Learning is transforming into a globally collaborative enterprise. Take for example scientists; professional networks allow the scientific community to share discoveries much faster.
http://newsroom.opencolleges.edu.au/features/20-tips-for-creating-a-professional-learning-network/
http://newsroom.opencolleges.edu.au/features/20-tips-for-creating-a-professional-learning-network/