Is everthing linked in your contacts section with Facebook at windowsphone.com ? (View Contacts / Manage Services).
How To Enable Built-in Facebook Chat On Windows Phone 7 Mango.
One of the biggest positives Windows Phone 7 has to offer is its Facebook integration. As of now, no other smartphone platform can claim to have the level of Facebook integration that WP7 has. The coolest part of Mango’s romance with the blue social network is the availability of Facebook chat in...
Facebook Messenger for Windows Phone provides an easy and quick way to send messages or start chatting with individuals or groups of friends.
We take a look at how to set up Facebook Chat and Live Messenger on Windows Phone.
With little to lose in terms of features (Facebook doesn’t offer voice or video chat) this free app (available from the Windows Phone 7 Marketplace) presents all of your currently signed in contacts in a list and lets you start text chat conversations with them.
Just follow the steps to link with windows live id through facebook to get facebook chat on your windows phone mango..... ->sign into your windows live account,this can be done by heading over to http://profile.live.com from your pc browser...
How do I create a client for the facebook chat for windows 7? I know that you have to use a Jabber / XMPP, but sockets are not compatible with wp7, how can I do?
Facebook Chat support is available in the app if you’ve connected your Facebook account with your Windows Live account through Messenger.
We have confirmation today that this release will finally include Windows Live Messenger and Facebook chat support in the People Hub alongside native support for check-ins a handful of other additions