One of my new favorite tools for Chrome is Google Tone!
My district invested in Hapara which allowed our teachers in our 1:1 Chromebook program the ability to manage the devices while in the classroom. One of the features I liked (there are some I don’t agree with pedagogically) was the ability to push out a new tab to each enrolled device in the class with a specific URL. Now Google Tone can replace that ability.
Google Tone turns on your computer's microphone (while the extension is on) and uses your computer's speakers to exchange URLs with nearby computers connected to the Internet. You can use Google Tone to send the URL for any web page, including news stories, pictures, documents, blog posts, products, YouTube videos, recipes—even search results. Any computer within earshot (including over a phone or Hangout) that also has the Google Tone extension installed and turned ON can receive a Google Tone notification.
I would highly recommend you check out Google Tone!