Once in a while there comes along an idea thats so bizzarre and yet surprisingly useful, Chirp is one of them.  Anything you wish to share is converted into a sound byte that you chirp across to phones and people around you. Did you just chirp your party pic? Something like a hyperlocalized twitter on sound waves.

chirp
Chirp
Developer: Animal Systems
Category: Communication
Google play Rating: new app
Install from Google Play

Chirp.io also plans to integrate with 3rd party apps for more interesting services which seems to be worth looking forward to.

At the moment you may not want to share any sensitive information as everything hits the Chirp service, but nevertheless a fun and interesting app to try out. – TheAppCurators

Google Play Description:

Chirp

Chirp is the magical new way to share your stuff – using sound!

Chirp ‘sings’ information from one phone to another.

Share photos, links, notes and more: all from your built-in speaker!

Anyone in listening range can then hear the chirp sound and receive your picture!

• Share photos with groups of friends
• One button-simple – just chirp it!
• Share any link you like

Chirp works on all Android 1 Ghz dual-core phones.