How to Bold Letters on Facebook
Chances are that you've never seen a Facebook status update that featured bold lettering, since Facebook doesn't offer support for text formatting in news feed items. However, there are a few places in Facebook where you can make your text bold. The Facebook Note writer includes a bold icon for formatting your note text, and Facebook Chat allows you to make any full word bold by surrounding it with symbols.
Bold in Facebook Chat
Click the "Chat" tab in the lower-right corner of the Facebook window, and click on the friend you'd like to chat with.
Surround text that you wish to send in bold letters with two * symbols.For instance, to write "hi!" in bold, you would type: *hi!*
Surround text that you wish to send with bold and underline lettering with *_ and _*. You must precede the first underline with a star, and follow the second underline with a star. No other order of symbols will work.For instance, to write "hi!" in a bold underline, you would type: *_hi!_*
Bold in Facebook Notes
Click your name in the upper-left corner of the Facebook window to access your profile page.
Click "Notes" to access your Facebook Notes. Click on a note to edit it, or click "Write a Note" to create a new note.
Highlight the text that you wish to make bold, using your mouse.
Click the "B" icon at the top of the note to change the highlighted text to bold.