In essence, microblogging is semi-synchronous publish-subscribe messaging. It’s publish-subscribe because it decouples senders and their reader(s), who can choose which senders to follow at any point in time. It is semi-synchronous because readers can choose either to follow it synchronously (via various desktop tools, or their mobiles), or read it later. In the Western world, the penetration of PCs is almost universal, so we have other PC-dependent messaging options such as blogging (asynchronous publish-subscribe); email (asynchronous point-to-point); instant messaging (synchronous point-to-point). Yes, none of them offers quite what Twitter does, but the majority of people in the majority of situations can make do with the conventional options.
Contrast this with the situation in third-world nations: PC penetration is incredibly low, but mobile penetration is incredibly high. For example, India has about 40 million PCs but 10 times as many cell phones. This makes short text messages sent via SMS the main written communication mechanism. Blogging, email, and IM are just not options, so microblogging becomes the main form of publishing, communication, and self-expression.
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