In the past 12 months I've connected two pairs of strangers with a common cause. The first was a professional connection where I matched up two people working in the same sector (via LinkedIn); the second was on Facebook where there was a common interest.
In simply connecting those pairs of people I've opened out all their networks to new people, skills and interests.
This is the power of the network, and moreover, the network of networks - bridging two networks to create a bigger whole.
The 'networks of networks' is an area that is central to the work that my employer does. As I grow my many networks I'm beginning to see the benefit and value this holds.