Social networking site Facebook with more than half a billion users, but a few people know that it has its own keyboard shortcut to open the Notifications, write new messages, open the home page, personal pages, search, settings ... for each of these shortcut keys, if you’re using Firefox, you’ll need to use Shift+Alt instead of just Alt, and for Internet Explorer you’ll need to hit the Enter key after the shortcut to trigger it. If you’re using a Mac, you’ll need to use Ctrl+Opt instead of Alt.
