diberry - 5:54 pm on Jul 12, 2013 (gmt 0)
It better not. That's just balls out ridiculous right there. NOFOLLOW is supposed to be used for sites you don't feel you can vouch for. There are no circumstances under which I would not vouch for my own sites, and if I invite a guest blogger, I am happy to vouch for his/her sites or the invitation wouldn't have been offered. If guest blogging spam has gotten out of control, then let Google go after *that*.
I agree, but the problem is that it's a guess about intent. No one guesses correctly 100% of the time, so Google IS going to get it wrong sometimes. And they're probably more likely to get it wrong on less established sites that send less positive signals just because they're new. And that's too bad because those are the sites that really need genuine marketing strategies like this. (I'm talking here about being a guest writer, which is also now a more dubious thing - if dofollow isn't applies by the other website admin, or Google thinks you used a keyphrase once too often, or Google thinks two guest posts you wrote are too similar, you could get penalized, too).
So the only way to be safe is to use nofollow on all guests posts. When Cutts defines nofollow differently, I have to believe he's not really thinking of all these types of cases webmasters deal with.