"The couple wish to strike a balance between a day that is sacred and intimate and a day that will be a cause for global celebration. To that end, they want the wedding to be as accessible to as many people as possible and that's why they are communicating in this way," a St. James's Palace spokesman said Tuesday, declining to be identified because of palace policy.
"William and Catherine have thoroughly enjoyed the process of creating their special day. They have been responsible for everything from the smallest detail, such as the reception canapes, to the big decisions like the carriages," he added.
Officials said this will be the first time YouTube has run a live blog alongside a live stream for an event.
The palace also plans to post addition royal wedding-related photos on Flickr leading up to the wedding, and expand its coverage on the Official Royal Wedding website, which has seen more than 8 million page views since its launch.
An official souvenir program will be produced for sale to crowds lining the parade route. It will cost 2 pounds ($3.20).
The program will include Middleton's new coat of arms, which uses an acorn to symbolize strength and continuity.
