Here’s a short guide to doing bold and underline in Facebook chat. It’s pretty simple, but can add some good emphasis to your conversations. They haven’t added different fonts in Facebook chat yet, but they probably will soon. The formatting in FB is similar to Google Talk’s bold and underline system.

Magic! You now have bold Facebook chat and underline Facebook chat text!
Comment using Facebook!
May 30, 2009 at 2:16 pm
Very useful, and fun to annoy people by bolding one word and underling the next in a sentence. Very amusing, do it to your bf/gf!
June 21, 2009 at 1:27 pm
wow. that was reallyyy helpful. thank you so much.
June 23, 2009 at 3:38 pm
is there any way to do italics, perhaps?
July 19, 2009 at 11:01 am
Does this also work on the status updates?
September 27, 2009 at 9:55 pm
no
July 20, 2009 at 1:57 pm
suite
November 3, 2009 at 8:43 am
thx this is kwl
January 4, 2010 at 9:14 pm
is there an italics one?
January 28, 2010 at 11:55 pm
can you do both?
June 2, 2010 at 5:30 pm
…hmmmm ..u can do both …like ds oh.. *_your text here_*
May 12, 2010 at 10:04 am
yes *_bold and underline_*
May 27, 2010 at 3:08 pm
it was cool and helpful….
June 29, 2010 at 2:29 am
soo kewl ! tenkx so0o0o0 much ! :*:*