Hipster has launched their official mobile app for the Google Android mobile platform.
• Choose your postcard style from many gorgeous themes.
• Share your postcards on Facebook and Twitter.
• Keep track of where your friends are and what they are doing.
• View the most interesting postcards that were sent from your location.
• Tag the friends who are in your postcards.
The service started off as a location based Q&A platform. But they are now more into offering a travel log.