I agree with Dylan Greene. He predicts that the new tag attribute will not prevent comment spam because of the following issues:

1. The text of the spam messages will still be indexed by search engines.
2. Humans will still see the the spam messages.
3. Humans will still be able to follow the spam links.
4. Most importantly: Spammers can still post spam messages.

I think the new tag will help with comment spam but ultimately filters will still be needed to keep spammers away.

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