The buzzing sound is from the vuvuzelas, long thin horns native to South Africa. You may have heard them before at the 2009 Confederations Cup, also hosted by South Africa. They are somewhat controversial, but were eventually allowed by FIFA due to them being essential to the South Africa soccer experience.
I noticed it too and realized what it was: horns! It's those long thin horns that everyone is constantly excitedly blowing, creating a buzz-like sound.
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