Take the 2-minute tour ×  Whenever we add a comment there is
this textarea box. OK the first thing that gets into my mind is
that I can press the "Enter" key in a textarea box and it will
give me a newline. If its a normal 1-line textbox, I will know
that if I press the "Enter" key it's submit.  Do you think it is
a wrong decision to use a textarea for the "add comments"
feature?  share|improve this question Well, I'm not a UX guy,
but the comments on SE sites are multi-line and the Enter button
submits. Seems to work well for me. –  Ed S. Jun 3 '11 at 5:24
@Ed S: I never realized that until you mentioned it. I think
it's not good UI. Since it only has an "add comment" button,
that would signify that the right way to send the comment is to
click that button, not hit the enter key. If SE wants to design
a dual sending mechanism correctly, they should take a tip from
Facebook's private messaging system (read my answer below). – 
JoJo Jun 3 '11 at 5:35 @JoJo: yes, the enter = submit on SO
comments has caught me