I’ve added several new Tumblr blogs that I feed automatically with RSS feeds of free Kindle books. My software adds my affiliate ID to the feed so that I might make money on the some day.
The blogs are:
The problem so far, is that people who look at free stuff, rarely buy things that cost something. I will eventually pick up some affiliate sales from these, but for now, it is slim pickings. All it has cost me so far is a few minutes time.