About 2 years ago was when WPMU's were at their peak for spamming. At that time, the remote posting feature was on by default. Using a program like Blogslammer, you could create literally hundreds of blogs in few hours on complete autopilot. It would search form WPMU's, create the account, click on the email activation link, store the URL's and passwords, post your articles (and spin them), add RSS feeds and post your affiliate links.
Then Wordpress came out with an update that turned off the remote posting feature by default and that killed the feature that spammers loved and took advantage of. They saw the end coming and started selling their software, like Blogslammer. Now it does still work, but you have to put in a whole lot more work into using it.
You can still get Blogslammer, but it has lost most of it's appeal unless you have a lot of friends who will let you set up sites on their WPMU blogs. I quit using it because I'd put in hours of searching for thousands of blogs and only get a hundred or so that would let me create an account and out of those only a few dozen would activate. On top of that, those were pretty much abandoned blog sites and spammed to death.
That is why I tell anyone who will listen to be very wary before buying any software that seems too good to be true. Why would someone be willing to sell a software that is making them tons of cash with little effort? It is because they have milked the best out of it and now it is no longer as effective. I learned that the hard way with Blogslammer. It cost me a $100 to learn that lesson, but it has save me thousands by not buying into every get rich quick WSO that comes out.
