You need a permit (PDF) to use amplified sound in New York City. Which the #OccupyWallStreet protesters haven't got. So they've come up with a unique solution for transmitting their message - the human microphone.
If you're wondering why whitehouse.gov hasn't been updated since Wednesday, it's because they're still working on bringing the Whitehouse into 2009 technologically. Will it have WiFi? Hopefully they can catch up quickly to what they were used to during the campaign.