Opinion search (Liu, Web Data Mining book, 2007)
Can you search for opinions as conveniently as general Web search?
Whenever you need to make a decision, you may want some opinions from others,
Wouldn’t it be nice? you can find them on a search system instantly, by issuing queries such as
Opinions: “Motorola cell phones”
Comparisons: “Motorola vs. Nokia”
Cannot be done yet! (but could be soon …)