Is there any reason my backspace (delete) key won't work on Facebook?

Chalk this one up to bizarre, but just the other day, while trying to type a note to someone on Facebook, the backspace/delete key wouldn’t work. (Just checked, today as well.) Specifically, Safari on the Mac. First, I thought it was some sort of new “feature” in Facebook, but why? Well, I know I can use Firefox, but it seems dumb to load up a different browser. More importantly, I could just stop using Facebook! Still, though, can someone try to emulate this for my own sake!