TechCrunch just posted about a neat implementation by Fluid for using the Facebook network as an IM backend (I wasn’t aware of an IM API from Facebook).

Its a cool scenario, and it highlights one of the scenarios enabled by the Windows Live Messenger Web Toolkit we recently announced.

The one big difference I see is, even when Windows Live Messenger users aren’t on a web site they can be reached. The intersection of your friends who are on a specific website (I.e. Facebook) to chat with is always going to be low.

Luckily the Windows Live Messenger is installed on hundreds of millions of desktops, mobile devices, etc. so people can be reached anywhere.