I think there are similarities between Facebook and Twitter in that the networks that form are localized within groups of individuals that are familiar with each other. Facebook originally did not have a spam problem up until they themselves decided to spam their users in an effort to monetize their traffic.
Twitter, if it is to be profitable through advertising, will have "spam" in the form of advertisements from within Twitter the same way Facebook has various forms of spam from within (Facebook apps included!).
Nonetheless, 1 million users along with the claim of the article is impressive at this point. I don't use Twitter (how un-2007/2008 of me no doubt) so I cannot comment on getting spam.
Twitter, if it is to be profitable through advertising, will have "spam" in the form of advertisements from within Twitter the same way Facebook has various forms of spam from within (Facebook apps included!).
Nonetheless, 1 million users along with the claim of the article is impressive at this point. I don't use Twitter (how un-2007/2008 of me no doubt) so I cannot comment on getting spam.