add desktop notification via Notifications API
User should be able to configure his notifications (which notifications to receive -mention, new message- and where - email, browser).
For desktop notification there's a W3C API. IE doesn't support them (http://caniuse.com/#feat=notifications)
Here's a wrapper https://github.com/alexgibson/notify.js
Frederik Brost commented
I can suggest the ZetPush https://zetpush.com/ is a tool for push notifications.
Stephen Finucane commented
This already works on Chrome
Solerman Kaplon commented
This seems to already work (at least on chrome?)