BACKGROUND 0001 Electronic commerce over the Internet is becoming more and more
popular, with more and more products and services being offered online. The types of
products and services vary; well known examples include consumer elec tronic products,
online travel services, restaurant reserva tions, and so forth. 0002 Many of these products
and services are accompa nied by customer reviews that provide valuable information not
only to other customers in making a choice, but also to product manufacturers and service …