I'm sorry for rageskitching about Facebook, but I can't help it. I've seen this bug too many times and I would really like someone with commit access to the Facebook CSS to fix it.
It's a matter of 3 pixels, but it matters. Here's what it looks like right now live:
And here's what it would look like fixed.
Can you see how much more crowded the text is in the unfixed version, and how much more balanced it could be?
I also couldn't help myself and fixed the bottom area of the comment addable extra too— that stuff needs just a tiny little bit of love. I can't stand uneven padding. A site that fixes these problems is a site is being taken care of with the loving attention to detail of someone who can see the difference.
3px means a lot more for a site like Facebook than the pixels themselves.