iWasThere app for iPhone and iPad

Take your photos and upload them to the map and let the world know you were there. Link your photos with ongoing events or create your own events.
Follow your friends and favorites and get instant notice of what they snap, like or say.
Explore the map to see interesting photos all over the world. Comment and vote: you can like or dislike a photo.
Share any photo on Twitter and Facebook or using email. You can also send photos to Instagram app or share your whole map.
To avoid mobile data consumption, you can take your photo and use the Upload later button: your photo will be stored on your iPhone; flush your upload queue when you are on a Wi-Fi connection.

Note: all pictures are published under Creative Commons Attribution 3.0 Unported License. More info at http://creativecommons.org/licenses/by/3.0/