I am not saying it is from Amazon, I am saying it is like an Amazon review (which this website links to as well:
http://archive.ala.org/teenhoopla/reviews/reviewsites.html
For those that don't know, anybody can sign up for an identity on Amazon, Barnes and Noble, etc. and can submit their reviews, musings, and other ramblings about whatever book they might choose. Others can and do read those reviews and use it (wisely or not) to decide whether to read the book.
It's one of the hottest things on the internet--user created content. Larger libraries are toying with having their patrons add reviews to titles in the online card catalog. It may seem simple but it's a pretty radical notion for some librarians.
The only reason this Teen Hoopla looks complicated is because the review you cite is from 2002 and ALA does not use that campaign to promote teen reading. When it was in use they accepted reviews from online users like Amazon and all the rest. You can see at the end of each review a screen name like book worm or crystal p. or whatever--much like the names people use on this board.
Further, you can follow this link for more insight:
http://archive.ala.org/teenhoopla/disclaimer.html
Which reads:
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YALSA offers Teen Hoopla for use primarily by teens. The listed sites cover a variety of topics that may be of interest to people in the age range YALSA serves - between the ages of 12 and 18. YALSA recognizes that teens develop at different rates and in different ways (including, for example, physically, socially, mentally, emotionally, and spiritually.) YALSA therefore encourages parents to be actively involved in helping determine the appropriateness of the Internet in general as well as any particular sites for their individual teen.
Recommendations are for the sites listed, not for sites linked to from the resources listed here.
***
As more and more users contribute content to the internet there is going to be a learning curve as readers try to figure out what is produced by the writers and editors of the people behind the site (which may be a university or a journal or newspaper or an organization) and what is produced by the public at large. It behooves the reader to learn how to discern the source, and it will continue to be the duty of the librarian to teach that.