At a recent Buckingham Palace reception to Meet the Press, a first-ever Twitter room was set aside for mobile phones. Twitter's General Manager in the United Kingdom, Tony Wang, snapped the historic sign.
Watch the videos of the garden parties in London and Edinburgh, Scotland and choose which one you'd like to attend. Perhaps you prefer the sedate grandeur of the Buckingham Palace grounds? The earthy elegance of Holyrood House and its skirling pipes?
William and Kate really should keep an eye out for phantom wedding guests on Friday. History is never too far beneath the surface in London and sometimes the past can seem a little too close for comfort, especially when your route takes you through an area so steeped in ghostly legend.