The current version is for iOS only, but an Android version is coming soon.

Here's how it works.

To use Chirp, you open the app, and ask the recipient of your choice -- it could be one person or 10,000 people -- to open the app as well.

You can take a picture with your phone, or choose a picture from your phone's camera roll. Alternatively, you can enter a note, or a web site URL.

Chirp gives you a yellow button. Just press it, and a two-second chirp sends your content to everyone else within earshot. Your words or your picture pop up on their screens a second or two after the chirp sounds.