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Unfortunately, until now, a comment on Facebook was forever. But Facebook has now amended this limitation and now allows us to change the written text.
To edit your comments, move the mouse over the comment you wish to change and you will notice the presence of a new icon in the upper right of this. This icon (a pencil) allows access to two options, Edit and Delete.
Facebook will maintain a public register of all changes made in the comments. It avoids situations where you could write something and then change to another in abuse.
Another innovation, also presented this week, was the availability of emoticons on Facebook chat. These emoticons are only available on Facebook talk within the site.
In addition to the listed emoticons there are a few which can be used. Have fun finding them and use them. For example, [[Zuck]] shows the face of Facebook creator.
* image is mine *