The house of Windsor has fully embraced social media. The wedding was even broacasted live, and for free, on their youtube channel.
Find below the links to all their channels.
Official Wedding page: http://www.officialroyalwedding2011.org/
Facebook: http://www.facebook.com/TheBritishMonarchy
Youtube: http://www.youtube.com/user/TheRoyalChannel
Flickr: http://www.flickr.com/photos/britishmonarchy/
The British Monarchy: http://www.royal.gov.uk/
On Twitter: http://twitter.com/#!/BritishMonarchy
