Best Answer torka , 25 April 2013 - 10:46 AM
Well, they're no "illegal" in the sense that the police aren't going to show up at your door and arrest you for using them...
But Google does tend to frown on artificial link schemes. And any "network" that's setup for you for the specific purpose of optimization is the very definition of an "artificial link scheme."
You might be able to get away with it for awhile. But Google's algorithm was build on links. There are few people on the planet who are more knowledgeable about linking patterns that Google's engineers. No matter how "sophisticated" the network makers think they are, they can't out-think Google forever. The time will come when these networks get taken down, and they'll take down all the participating sites with them.
Just ask the folks who got caught up in any of the network "take downs" over the past couple of years about how well link networks did for them. This article I found, from a little over a year ago, might be helpful.
--TorkaGo to the full post