To put it mildly, many "happy birthday" wishes on Facebook are... impersonal. Even if you know someone well, you can't help but look like you're brushing them off with text and the odd photo. Facebook just gave you the chance of offering something more meaningful, however. It's trotting out a birthday video cam that lets you quickly record a 15-second clip to celebrate a friend's yearly spin around the Sun. The feature is only available on iOS for now, but it could still go a long way toward cheering someone up on their big day.