Hi, I've been analyzing competitors and I notice many will have backlinks from WP posts of relatively unique articles with keywords embedded in them. I see this ALOT. I do not think all these sites are operated by the same people, so can someone explain what the process is for this? (advertising your site through an article that random bloggers carry). How are they getting articles posted, is there an adnetwork that organizes this... I'd like to know the science behind this from step A to Z, thanks for the help.