How can I recover my deleted comment on my friend’s photo on Facebook?
I'm afraid this isn't possible at this time.
by the way it's your comment, go and comment again! simple!
if you really want it, you can find it in your friend's mail notification. or text message notification or anybody who commented on the photo will receive your comment on mail and mobile if activated facebook mobile.
if you explain exact purpose, may be you can get more help.