Event invitation "upgrade" has removed the ability to invite all friends from a friends list

A new invitation panel for Events has been released that has removed the ability to select all friends from a particular friends list in order to send them an invite.  This has thus rendered friends lists useless for events. Strangely, the new friend invitation panel has NOT been rolled out for Facebook Page suggestions, nor for Facebook Group invitations, so one can still use friend lists to mass-invite to either of those, just not events.

The new event invitation panel, with a friend list selected- note that there is no option to select all of the members of the currently-selected friend list.

According to allfacebook.com this was rolled out on or around March 18, 2011.

If this is meant as a way to discourage event spamming, this goal will not be accomplished because workarounds exist to spam all friends, regardless of friend lists.  In fact if anything, this only discourages proper use of friend lists and promotes mass-spamming tools.

Photo Browsing on a Single Page - Lost ability to view all comments

With the release of Photo Browsing on a Single Page, the ability to "View All Comments" within a photo album was lost.  Manually paging through all photos by hand is the only way to see which photos attracted the most amount of social activity.

http://blog.facebook.com/blog.php?post=415960417130

New Photoviewer - loss of "L" keyboard shortcut for "like"ing

With the new photoviewer, the keyboard shortcut of "L" to like the currently-viewed photo no longer works.

https://blog.facebook.com/blog.php?post=432670242130

Profile-Like Facebook Fan Pages ("An Upgrade for Pages")

The new profile-like Facebook Fan Pages have removed the ability to have a chronological feed order (fixed - http://www.facebook.com/FacebookPages/posts/10150203087874572 ).

Also, with the removal of support for Tabs, many apps no longer work properly. For example, the following Facebook-developed apps have disappeared from any pages that used them:
- Music Player
- Discography

http://www.facebook.com/notes/facebook-pages/an-upgrade-for-pages/10150090729064822

Privacy-related older features lost

- Ability to set privacy on current city, hometown, education and work, and likes and interests (Apr 2010)
- Ability to set privacy on friend lists (Dec 2009) (this was later fixed)
- Ability to set privacy on profile pictures (Dec 2009) (this was later fixed)
- Ability to hide "add friends" and other options from the Profile from non-friends (Dec 2009)
- Ability to hide Recent Activity, thus directly making previously hidden data public (such as commenting, friending, etc) (Dec 2009)

via Anything PRIVATE shall never be made PUBLIC

Unified Messaging

The unified messaging, currently in beta (opt-in'abble) has gotten rid of subject lines. As a result, now that messages are sorted by recipient instead of by conversation, it is impossible to distinguish individual subjects/conversations.

Also, messages sent to more than one person can no longer be branched off into private conversations with just the original sender. They are group conversations only.

http://www.facebook.com/about/messages/