A bit off topic, but… I just noticed you can boldface and underline text in your Facebook chat conversations.
To boldface text, simply wrap it in asterisks, like so:
I am *boldfacing* text
To underline text, simply wrap it in underscore marks, like so:
I am _underlining_ text
You can even combine styles, like boldfaced underlining, by putting
I am *_boldface underlining_* text
The formatting does not appear to work in status updates. Oh well.