The author says: Some of them did not even exist a year ago. One of my goals is to show my readers the “latest and the greatest” search engine innovations. The motto for the blog [ASE], after all, is “the most wonderful search engines you’ve never seen,” and my favorite comment of all is, “Wow! I didn’t even know that most of these existed!”
These are great examples to give students in class exercises to show them that the Google way is not the only way!