Two months after Matt Cutts had announced the "decay and fall of guest blogging for SEO," Google has taken a major action against a guest blogging network, myblogguest.com.
Today we took action on a large guest blog network. A reminder about the spam risks of guest blogging: https://t.co/rc9O82fjfn
— Matt Cutts (@mattcutts) March 19, 2014
Currently, MyBlogGuest does not even rank for it's own name in search engines. Google appears to have targeted the MyBlogGuest website and possible network with a manual action penalty.