From Buckingham Palace to Westminster Abbey.. London visitors are all a twitter about the royal wedding. The British royal family has jumped into the digital age, posting details about the ceremony, now just four days away.
Victoria Arbiter, CBS News Royal Contributor, says, "They have a very active Twitter feed going. They also have a Flicker account, a YouTube channel, they also have a Facebook page."
Prince William and Kate Middleton encouraged the monarchy to use social media - to court a new generation of fans.
London Visitor Allison Milan says, "You can find out where things are going on and when. And who is talking about what it's a big buzz on the internet."
After generating so much buzz, the palace is putting up big screens in public places like Trafalgar Square to allow as many people as possible to witness the wedding. The Royal YouTube Channel will also stream Friday's ceremony live and it's already inviting well-wishers to post messages for a video wedding book.
An iPad app offers a bride's-eye-view of the walk down the aisle.
But smart phones will be a no-no for guests inside Westminster Abbey.
Etiquette Expert Sarah Haywood says, "No texting, definitely no tweeting and absolutely no snapping your camera and putting the picture onto Facebook. Ultimate faux pas."
More than 750 million tuned-in to Prince William's parents' wedding. With the internet and social media blitz as many as two billion will watch Will and Kate tie the knot.