Recently Twitter updated their layout to include a header image. This is similar to the cover image for Facebook. Web Services will be updating the header images and the background images for each departmental Twitter page.
header image – swap in the current background photo or a better image, approved by the department.
background image – the generic Emerson-centric image above.
thumbnail image – stays the same.
The inclusion of the header image is most important because the header image is visible everywhere, including mobile devices (iPhone, iPad, Android phone, etc.) while the background image is only visible on a desktop computer.