Facebook Instant Messenger (Fim) is an lightweight and touch friendly instant messaging application for Windows Mobile Phones (Pocket PCs).
# Facebook Chat
# Status Feed
# Notifications & Inbox Indicators
# Picture & Video Uploads Directly From Your Phone
# Integrated m.facebook.com Browser
# Supports all WinMo PocketPC Platforms (WM6.5, WM6.1, WM6, WM5, 2003SE)
# No 3rd Party Registration
Download the mobile installer (.cab file) to your desktop. Sync with your mobile phone and copy the .cab installer to your phone. From your phone go to Programs -> File Explorer, navigate to the .cab file and select it. The Installer should do the rest.