移动可以也应该成为社会网络的核心。
Mobile can and should be very much be at the heart of social networks.
而这些受欢迎的人趋向于更接近社交网络的核心。
And those popular people tend to be closer to the core of a social network.
这些对金融中心也颇重要，因为这些交易中心仍然是世界金融网络的核心。
Trading costs have come down, too. This matters to financial centres, because exchanges are still at the heart of the world's financial network.
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