[ars]

No, it's a mistake, they should have left the original date. If you update it you are supposed to do year, year, year or a range.

See: http://en.wikipedia.org/wiki/Copyright_notice

[kdommeyer]

I still doubt that Facebook, Microsoft, Yahoo, Twitter, etc. are all mistaken in listing the current year in their copyright. That seems implausible.

[phillmv]

Things aren't as cut and dry with legal traditions. I'm sure there are tons of scraps of legal language that remain in use only because it's traditional and few people know any better. Like some kind of legal shibboleth.

Like coderdude said above[1], whenever you see "All Rights Reserved"[2] you're seeing it in action.

1. http://news.ycombinator.com/item?id=3541501 2. http://en.wikipedia.org/wiki/All_rights_reserved