Facebook Changed its Page Tab Width

Caution, Facebook Page administrators: Facebook is set to begin rolling out narrower Page tabs from 24/08/2010. The width of the tabs will be reduced from 720 pixels to 520.

The change was announced back in October 2009 but was delayed, presumably to let administrators prepare for the reduced tab width. Still, many popular Pages (pages) still use 760 pixel wide elements, which will look broken once Facebook implements the change.

If your Page contains elements that are over 520 pixels wide, you should reduce them to that width as soon as possible.