Il client di chat e notifiche per Windows 7 è finalmente disponibile, il pacchetto è scaricabile da qui:
https://www.facebook.com/about/messenger

Chat while you do other stuff
See and respond to chats right from your desktop. Whether you’re browsing other websites or using another app, you don’t have to click away to stay connected.
Get notified instantly
Find out about new comments, photo tags and more as soon as they happen.