Google Tone is a free Chrome extension which allows you to send and receive links via audio tones.
Install the extension and it adds a button to your address bar. When you're at a page you'd like to share, click the button and Google Tone encodes the URL and plays it as around two seconds of audio tones.
Anyone close enough who's also running Google Tone should receive a notification saying you're sending them a link (depending on your audio volume, background sound levels etc). If they're interested, clicking this opens the page in a new tab.
Google Tone worked for us, most of the time. And it's good to see that it can both send and receive links (the similar Chirp extension can only send).
As often with Google, though, there are privacy concerns. You must log in with your Google account before the extension will work. It also "temporarily stores a URL on Google's servers" before sharing it, and "collects anonymous usage data in accordance with Google's privacy policy".
Verdict:
Google Tone is an unusual way to share data, but it does work, and could be handy in some situations. Check out Chirp if you'd like something similar in an iOS/ Android app.
Your Comments & Opinion
Share links/ text/ images between devices - via audio?
Get a media server to rival Plex and Emby for free
View, edit and share videos one Vimeo with your iPhone or iPad
Manage and merge multiple iTunes libraries
Record audio with your iOS device and share via email or FTP
Make your chats more productive with Zenkit's task-based messaging tool
Make your chats more productive with Zenkit's task-based messaging tool
Make your chats more productive with Zenkit's task-based messaging tool
Make your chats more productive with Zenkit's task-based messaging tool
Chat to users across multiple networks using this messenger tool