More than four billion people worldwide are expected to tune in to watch the opening and closing ceremonies for the London Olympics - worth up to STG5 billion ($A7.7 billion) in advertising terms, organisers say.
Four billion to watch 2012 ceremonies
![Four billion to watch 2012 ceremonies](/_next/image/?url=https%3A%2F%2Fcontent.olympics.com.au%2Fpublic%2Fstyles%2Flandscape_header_section%2Fs3%2F2019-06%2FBeijing_OpeningC_Getty616_D5068C40-EECD-11E4-85C4005056A37760.jpg.webp%3Fitok%3D_HdkbDAm&w=1200&q=90)