No one can type without error at any time. After eight years Facebook now allows users to edit their comments. One of the most frustrating parts of commenting on Facebook inability to go back and edit. Now Facebook rolled out comment editing feature instead of delete.
Facebook users edit their typo comments 30 seconds after post it. After 30 seconds you can go and edit your comments at any time. When you edit a comment, you'll see a note under your comment showing the time it was edited. Anyone who can see your comment can see this and click on the Edited link to see what was changed.
This comment editing feature is very important and useful to all because lot of publishers started to using Facbook commenting system to their blogs and websites. But this comment editing feature yet not available to mobile platforms.
Via - TNW