UPDATE 28/06/2010
- Matchbox Mobile is working on a new Microsoft Facebook version which should fix most of the annoying bugs. No ETA.
- Here you can find Richard @ MatchboxMobile quote
Originally Posted by MatchboxMobile
Hi all,
Sorry for not having posted in some time, I've been off work for health reasons. I did want to let you know though that work on the new version is <finally> underway, and my hope is it'll fix most of the issues you're experiencing, certainly all the major ones. It's a bug fix only release, sorry no new features. I don't have an ETA for the release, but I'd expect it to be in the Aug timeframe.
Thanks for your patience guys, again I'm sorry updates haven't been coming a lot faster but unfortunately we're not in control of the process.
Richard @ Matchbox
Microsoft Facebook 1.2 is available on the Marketplace; Here you can find attached the CAB file (1.2 a.k.a. 1.1.0.17).
This version is out on the Windows Marketplace for Professional devices so it should work on every WM 6.5.x touchscreen phone and screen resolution.
If you should experience any problems, let me know so that I can add them to the bug list 
NOTES:
- Matchbox Mobile, the developer of the Facebook app on MS behalf is checking this topic.
If you should experience any bugs or if you have some suggestions for future versions of this app, feel free to join the discussion 
thanks to Richard and Matchbox Mobile for helping us out and gathering infos and bugs to improve the application
- For more info, please check the discussion linked in the following link: 
INSTALL
- If you had my previous 1.1.0.14 CAB, please remove that using the remove programs applet prior to install the new update.
- Download and install "Microsoft Facebook 1.1.0.17.cab". This is the original Microsoft Facebook CAB available on the marketplace.
- The previous 1.1.0.14 install files are still attached for archive reasons.
WHAT'S NEW
CURRENT VERSION: 1.1.0.17
- Bugfixes (?)
- Pokes seems to be working now.
Version 1.1.0.14
- Hopefully some bugfixes and improved speed
- Improved notifications system
- "View Comments"
- "Comment"
- "Like" (or "Dislike")
- “Search” (for new contacts or existing ones).
KNOWN TWEAKS
- Change Image Cache: http://forum.xda-developers.com/show...1&postcount=13(thanks to owziee)
- Change Facebook language: http://forum.xda-developers.com/show...7&postcount=66 (thanks to Real_Justus)
WHAT'S STILL MISSING (compared to other platforms FB apps)
- Live feed and chat.
- It's not possible to check who has "liked" any post/image/etc.
REPORTED PROBLEMS
1.1.0.17
- On some devices, after viewing a photo album, MS Facebook is unable to view any other contact's album pictures and generate their album list.
- On some configurations, MS Facebook is unable to remember login credentials after closing the app.
1.1.0.14
- Slow page scrolling reported on some devices.
- After viewing a photo album, MS Facebook is unable to view any other contact's album pictures and generate their album list.
- dominicanman912 reports that MS Facebook changed the volume keys mapping, so he's unable to change the volume anymore. There are no other reports of this issue.
- Facebook throws out an error while trying to fetch the inbox.
- megapinky is reporting he's unable to change photo to see another ones in the picture view, with gestures not working.
- Sometimes MS FB will not post updates once submitted; you'll need to try multiple times until your wall gets updated.
- pndragon reports that his all his news feeds are showing up as double posts.
- On i8000 if you should have install problems try follow this guide (thanks to b006): Restall v1.1 from Marketplace to override the preinstalled version, then go to Main Storage in settings and delete it (uninstall). Next install this version 1.2, not in main (since the preinstalled v1.1 is there to avoid conflicts) but in other storage options you have.
- On some devices, Facebook throws out an error message while trying to poke someone.
If a new Microsoft Facebook client version should pop up on the Marketplace, on the Microsoft Download web site or here, please remove the previous version using the remove programs applet prior to install the new update.
Here u can find attached some screenshots and the cab files:

Enjoy 