Matt Cutts thought that Guest Blogging has become nothing but just a spammy method.
So be careful all bloggers Stop guest blogging or if you have done so or you get penalized from Google, so remove the guest articles as soon as possible to get off this penalty.
Highlights of original article from Matt Cutts
Okay, I’m calling it: if you’re using guest blogging as a way to gain links in 2014, you should probably stop. Why? Because over time it’s become a more and more spammy practice, and if you’re doing a lot of guest blogging then you’re hanging out with really bad company.
Back in the day, guest blogging used to be a respectable thing, much like getting a coveted, respected author to write the introduction of your book. It’s not that way any more.