Facebook Notifications is described as 'For Mac OS X, Adds Notifications to your desktop, alerting you when interesting activity happens on Facebook! Note: This software is experimental and has only been tested on Mac OS X 10.5'. There are three alternatives to Facebook Notifications for Windows and Android. The best alternative is Gmail Notifier Pro. It's not free, so if you're looking for a free alternative, you could try Missed Notifications Reminder or fbquick.
Gmail Notifier Pro is a Windows application capable of checking multiple Gmail accounts for new mail and display notifications. Feature highlights - Check multiple Gmail accounts, including Google Apps, for new mail. - Supports both Atom and IMAP protocols for mail.