Well it's official.... Matt Cutts has decided that guest blogging is basically gotten too spammy. Here is what he wrote on his blog today:
"So stick a fork in it: guest blogging is done; it’s just gotten too spammy. In general I wouldn’t recommend accepting a guest blog post unless you are willing to vouch for someone personally or know them well. Likewise, I wouldn’t recommend relying on guest posting, guest blogging sites, or guest blogging SEO as a linkbuilding strategy."
It really has come no surprise to me honestly. But I am glad this may tone down a bit of the spam on guest blogging. Be sure to no follow your guest posts on your site.
What this means:
Well basically now you can't even guest comment by trying to include keywords that will trigger the site you blogged in for branding purposes such as your name or company. Though honestly it may be a small such volume or change, it's still somewhat relevant.
Here are some of Matt Cutt's video over the timeline about the guest blogging. You can really feel his frustration in his writing and read more of his whole article here.
And then if you want to get into the big "grey" area asking him these questions: