iOS: Need a good restaurant suggestion in Venice or a good club in Boston? Asknative provides a global iPhone-based community that can answer your questions before and while you're travelling.
Using the free asknative app, sign in via your Twitter account, and ask any questions you want. If you know the answer to a question someone else posted, you can answer. Beyond providing a place to share information on a global network, asknative will help you translate text so you can communicate even if you don't speak the language. It's also really easy to sort by location and type of question.
The app comes with several useful features for when you're travelling, including a special mode to avoid excessive data consumption (in the event you're on a limited plan or roaming). While you could post in a forum or just search for the answer you need, you may not always find it. Asknative provides a focused community and an app with features that can help you make the most out of your trip.
asknative (Free) [iTunes App Store]