Just an update - the app was having issues for a while due to the change in FB's app platform but it is functioning well again and we've also made it FAR more simple to see the flow of how you add deal alerts to your account.
A previous complaint was that you would install the app and not know what to do next. Now we guide you.... Add app, find favorite city, add city to Favorites, land on settings page to tell us how you want to be notified (daily, weekly, when price is under $xx) and by email or in FB notifications.
Further comments welcome