The smiley face emoticons that Facebook previously only allowed in messages and chat, are now available in comments. Whether this is a good thing or not depends on your circle friends. For a list of emoticons, see this article from FB Smileys.
Surfnetkids » Tech Tips » Facebook » Facebook Adds Emoticons to Comments
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Sally D says
I came across some pages where the comments were looking a bit different today. Took a second for me to realize that the Smileys aka Emoticons we use in the Comments and Chats had the actual graphical icons in the comments too. I also found this video: http://www.youtube.com/watch?v=1vJl3byw3Ps