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It could be there hasn't been a PR update since the pages received their last grade. And like CMC-SD said... Low PR doesn't necessarily mean anything negative. If you have a good trafficked page and it's converting - forget about chasing PR. I've had sites that have been PR3 and PR4 for years and drive a ton of high-value, converting traffic from the SERPs and rank for all kinds of fat head, competitive phrases.

Hi, thanks for responding! I'm certainly aware that many directories were affected by Penguin, but we tend to use trustworthy, hyper-specific directories that really do generate new clients for us. Since directories like this (webdesignfinders for web design, for example) are less for the link and more for the lead potential, I thought they might be more likely to be in the clear, post-Penguin. Is anyone else adjusting their lead-generation strategies to accommodate this?

Facebook now has this functionality built in to pages, does it not? You can also use Buffer App which is a great tool...

What an amazing resource! Thank you.

Thanks, that really clears things up! For now, our main objective is traffic, so I'll keep the majority of my writing on our blog.

Thanks for sticking with me on this one. I recognize the things that you're talking about and you're correct on all accounts. Thanks again.

That may be at least part of the problem. If you're not able to share the URL with us in Q&A, I'd drop a note to the help desk at help@seomoz.org and ask them.