
Currently Facebook users have the ability to remove their comments, and if they try to remove the comments within 30 seconds, they can edit them. But now you will be able to go back and edit your comments any time, even all of your historic comments on existing status messages and the like.
In addition, Facebook will be showing the edit history for a comment, so that everyone else that comes along can have the full context of the conversation.

Source, Facebook Help Center







