This is the reply I got on their forums.
To contact TripAdvisor,
If you've 5mins to spare, please fill out their suggestion form and send it. Hope they update it (their iOS apps are updated twice a month).
I know that can feel discouraging but it's good to send the feedback anyway; the more people who do, the better. I don't see many members post about the Windows Phone app. I can use the app on my iPod but noticed that it doesn't even load properly on his phone. I've also mentioned Windows phone app issues with TA.
To contact TripAdvisor,
Click on this link:http://www.tripadvisor.ca/GeneralSupport
First box, select: Site & Features Next box: Mobile app or site (the rest is self-explanatory)
Any specifics you can give them, the better.
If you've 5mins to spare, please fill out their suggestion form and send it. Hope they update it (their iOS apps are updated twice a month).