One thing the WhatsApp demonstrated – this week – is the power of the PSTN address graph, and its ability to threaten Facebook’s social graph that has taken ten years to build. Lots of potential for those of us building different things. Benedict Evans today:
What they almost all have in common, though, is that they use the PSTN numbering system but never connect to the PSTN. That is, they look at your phone book and use your phone number to identify you and see which of your friends have it, but they don’t actually make phone calls or deliver any SMS. So for these apps the PSTN is a social graph but not a piece of infrastructure. Add things like home-screen icons and push notifications and one sees that the smartphone is a social platform, in a way that the desktop web never was.
Moreover, why should it only be explicitly social apps that access the phone address book to find my friends? Why shouldn’t a retailer’s app tell me that I have 8 friends using it, and let me share products with them rather than emailing them dumb, untracked URLs or even, quite probably, screenshots of my smartphone with the app open?