Perhaps you have already read, but I wrote about What does "Seen" mean on Facebook chat. It's an update by Facebook and tells you if the other person has seen your message, but hasn't responded yet . If you don't know anything about it, please read that article. Anyway, a lot of people have asked how to disable (turn off) that "Seen" feature on Facebook chat. Thanks to Aza Steel comment on the above article, this is possible to do. This only works with Google Chrome web browser.