Here’s a pointless Facebook error message:

There are a few things wrong with the text, not to mention an uninspired layout. The prose is redundant and fails to present a clear alternative. Worse, though, I see this type of message regularly while putzing around with Facebook. Can you imagine a Google page returning: search unavailable, maybe you can try again later?

My 0×02 bits? The best error message is the one that you never need to show.