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what do I do with 404 errors reported in webmaster tools that are actually URLs where users are clicking a link that requires them to log in (so they get sent to a login page). what's the best practice in these cases? Thanks in advance!

Take a look at centerforhealthysex.com/sex-addiction. For months we were ranking in the top 3 spots with this URL for "sex addiction los angeles", even reaching #1 for a while. Late last year we redesigned and developed the site to clean up the code and redirects. We also cleaned up the internal linking structure. For years we had been ranking on "sex addiction los angeles" for the home page ... bumping around the top 5 spots, but we wanted organic traffic to go to /sex-addiction. In the Fall, we saw overall site traffic rise steadily. We made few changes to the site and none to this page or links flowing back to the page once we had achieved strong ranking -- we didn't want to mess with a good thing. Then November 27th we started losing ranking on this term and a couple others. The good news is that we gained ranking on some high volume traffic terms so overall organic traffic is reasonably strong, BUT we're not ranking on the terms where we want to rank. Centerforhealthysex.com/sex-addiction is now nowhere to be found on the target search term despite fairly strong page rank. I tried redoing and resubmitting the site map, cleaning out some potentially duplicative content but to no avail. I see no issues, errors or warnings in Webmaster Tools. We have a few medium priority fixer-uppers in SEO Moz, but we've taken care of the majority of the big stuff. What am I not seeing? Thank you!

I'm considering working with a guest blogging company. The quality of the writing seems to be decent / not spammy. The types of sites they're guest blogging on are... http://theblogabouteverything.com/ http://globalgoodgroup.com/ I know these are fairly generic blogs. Is there any chance of a manipulative link penalty with these types of sites? Thanks!