A spammer could, in theory, start using twitter as their delivery mechanism (since, as far as I know, there aren't any anti-spam mechanisms in twitter, yet). In which case, they may start trying to get more people to join twitter and subscribe to them.
That wouldn't be twitter being spammers, just twitter being leveraged by spammers.
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That wouldn't be twitter being spammers, just twitter being leveraged by spammers.