After getting an iPhone recently, I've been using the Yelp app quite a bit to find good things near my location at the time. So, even though I'm already an avid user of TripAdvisor, I joined Yelp as well to review all kinds of things. I do use and like the TripAdvisor app, but in order to read the reviews you basically leave the app and go to TripAdvisor's website. I like Yelp becuase you can do it all (search, read reviews, write reviews, etc) within the app.
So, if you'd like to see more of the things and places I review (that I often don't post here) you can find me over on Yelp at pinkbird.yelp.com.