|what a bank employee once told us ...|
How does Amazon get away with it? Amazon requires that users assent to its Conditions of Use in order to post a review. Those conditions state: "You grant Amazon and sublicensees the right to use the name that you submit in connection with such content, if they choose."
What can you do? The safest route would be to use short excerpts from the reviews -- say 20 words or less -- and to avoid identifying the reviewer. Definitely don't use last names or screen handles, avatars, etc. First names and initials are probably fine unless they're so unique as to identify the person.
But what about what Amazon does on Facebook? There's a whole different set of rules when Amazon pays Facebook to use your name and endorsement on products.