[sirsean]

So ... why do people use Twitter, when blogs already existed?

[dutchflyboy]

What I mean is that most people who use twitter don't care at all whether the messages are on their own server or on a server owned by some company.

[sirsean]

The same is true of most people who use email, but email still wouldn't have become as widespread as it is today if it weren't interoperable with other email servers.