Fb:narrow
From Facebook Developer Wiki
Description
Renders the content contained by the tag only if the profile box is in the narrow column of the profile.
Examples
<fb:narrow>
This text appears only in the narrow column.
</fb:narrow>Notes
If no fb:narrow or fb:wide tag is specified, all content is displayed in either column.
The narrow profile box is 200 pixels wide, including margins. There are 8 pixels of padding on each side, so the actual amount of column width you can use is 184 pixels.
If you want your fb:narrow information to appear when installed, set the Default Profile Box Column value to Narrow in Installation section of your application's settings in the Developer application.
