Facebook for Windows Phone app just got updated to v4.2 in Windows Phone Store. There was no change log provided in the store, if you notice any changes, let us know the comments.
Facebook for Windows Phone makes it easy to stay connected and share information with friends. You can post status updates, receive Live Tile updates, check your news feed, review upcoming events, check in to places, manage your inbox, upload photos, publish notes, accept friend requests, pin Places and Messages as Tiles, and look at your friends’ photos, walls and info.
Find the update here in Windows Phone Store.