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Why would you use twitter for personal messages? It just doesn't make any sense :/

Because you don't always know the IM name of the person you want to message.

If it's a personal message, it's the equivalent of an sms on the web.

Sure. It just seems an odd choice. It's like using a blog to do revision control, by posting your source code as a new blog post each revision.

Each to their own though...