That will tell folks what that thread is about, and they can choose to respond, read, or move along. Replying to a message can be done for all to see, or you can privately e-mail the person to whom you're writing. Just make sure you know who is going to see your message before you send it. Canceling a Message . Cancel the message.
Someone says the movie's camera work was bad.
You write that you liked it. A flame is a nasty, insulting message. If you get flamed, ignore it. And by all means, don't do any flaming yourself. That's just good netiquette.