No, it doesn't. Your legitimate users log in, and you trust their links. The jitter you've linked to is from bloggers, who care about their own ranking but don't usually offer their visitors a login. Their inbound links (and thus, rankings) typically come from reciprocating comments on other blogs which don't have logins either, which is why they're worried.

In reply to Re: (OT) nofollow considered harmful (was: CPAN::Forum opens its virtual doors) by gaal
in thread CPAN::Forum opens its virtual doors by szabgab

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