I just got a email from amex
"Join Card Members on TripAdvisor to unlock these exclusive benefits:
Card Member Reviews
Share your experiences and read other Card Member reviews. Plus, get a $5 statement credit when you join the program and your next review is posted on TripAdvisor.¹
Card Member Hotspot Lists
Get access to exclusive lists of restaurants and hotels trending with Card Members around the world.
Card Member Perks
Take advantage of exclusive offers from California Pizza Kitchen, Maggiano's and The Palm by simply saving them to your Card. Also, unlock a $50 statement credit when you book a stay for $250 or more on amextravel.com."
I tried it and will report if it works. I did not see anything on DDF about this as of yet.
Here is a link:
https://sync.americanexpress.com/tripadvisor/?extlink=Email_Oct_2013_1