Today Facebook rolled out a change to their comments system.
The “Submit” button is now missing, and pressing the “Enter” key no longer adds a new line, it submits the comment.
The obvious downside to this is that comments will be posted incomplete, when users are trying to add paragraphs but accidentally submit the comment. Highly frustrating…
To add a new line, hold down “Shift” while pressing “Enter”.
If you make a mistake (such as accidentally submitting the comment instead of adding a new line), simply click the “X” key next to your comment. This will not remove the comment, it will allow you to edit it and save it again.
Note: It seems that you can’t edit your comments once a reply has been posted. I’m not sure about the specifics of this (is there also a minimum time limit to let you edit your comment even if someone replies 2 seconds later?), but this is worth knowing.