Yes, MySpace, much more than Google, had positive network externalities. But the high point of its user base was around the 100 million mark. Facebook now
has around 900 million users, and they average 20 minutes of use a day. So I still contend that, when you combine the power of Facebooks' network
externalities (as compared with, say, Google's) with the size of its network (which dwarfs MySpace's) you get a network externality oomph
unmatched by any other company in the history of IPOs.
I take Sohlstrom's point that positive network externalities aren't enough. You have to have a sound strategy as well.
But here we've already seen some impressive things from Facebook. Unlike MySpace, Facebook saw early on the value of allowing other companies to develop
apps for its platform. This in turn created another kind of positive network externality, more akin to the externalities that operating systems like
Windows or iOS or Android enjoy: the more users the network has, the more apps it will offer.
Even more creative was Facebook's "Connect" program. It's the reason that, near the top of this page, you see the Facebook icon, which you can click to tell your friends what a wonderful post you're reading. (I'll pause now while you do that...) It's also the reason you now see the Facebook icon everywhere else on
the web, too.
This feature, like opening the Facebook platform to outside apps, further increases positive network externalities. It makes it even truer than before
that, the more people there are on Facebook, the easier it is for you to tap other people's brains to find out what's worth reading on the web.
Has Zuckerberg committed blunders? Yes, I think "frictionless sharing"--which I skewered here--is an example. In addition to annoying people who
hadn't realized their reading habits were being broadcast, frictionless sharing makes Facebook a less valuable place to find out what's worth
reading on the web; frictionless sharing happens before your friends have read and evaluated something, rather than after they've read it and
decided it's good--so you're no longer benefiting from their judgment.
But the unprecedented positive network externalities Facebook enjoys mean that the company has plenty of time to recover from mistakes like this. People
who get disenchanted with Facebook have nowhere else to go unless they want to move to a much smaller network--which, thanks to the logic of network externalities, is a less valuable network, a network they're not inclined to move to.
It's certainly possible that some unimagined "disruptive" technology could undermine Facebook. And I realize that it's inherent in the nature of disruptive
technologies that not many people see them coming. Still, I'd take the disruption prospect more seriously if someone could get give me a plausible, step by step
scenario in which an aspiring rival--even a very well-financed rival that already has valuable assets on the web--could successfully invade Facebook's turf.