Well, not to worry about it anymore as Facebook frequently trying to bring us new changes and updates to make more user friendly interface, Few days before Facebook added a new feature "Facebook allows its users to edit their comment rather than deleting and rewriting them" So, now you have a option that all your comments are editable or you can say re-writable.
How to edit your comments on facebook :
This option is for all comments.
Step 1: First, go to your comment page as like below :
Step 2: Now, take your cursor over your comment, look at the right side of your comment you will able to see a edit pencil icon click on it.
Step 3: Now, a small menu with edit and delete option. Select edit if you would like to edit the post or if you would like to delete the post click delete.
When you are done with your editing just press Enter and you are done.
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