I've seen plenty of Twitter spam, but it looks like the sorts of tools that started appearing 4-5 years ago for blogs are popping up for Twitter now:

Last week, a commercial Twitter spamming tool (tweettornado.com) pitching itself as a “fully automated advertising software for Twitter” hit the market, potentially empowering phishers, spammers, malware authors and everyone in between with the ability to generate bogus Twitter accounts and spread their campaigns across the micro-blogging service.

As ZDnet points out, creating this kind of tools is dead simple - Twitter doesn't even verify your registration address when you sign up. This can't be the first tool of this kind though; there have just been too many spammers around.

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