Britain's royal family has shown itself to be tech-savvy in recent years and maintains accounts on several social media sites.
Residents in Hancock Park, the exclusive neighborhood that is home to the British consul general where William and Kate will stay, worked with police to create no-trespass notices for their homes. Any photographers standing on their driveways would be instantly arrested, though by late Friday the police said there had been no arrests.
On Saturday, the couple is traveling along the scenic Pacific coast from Los Angeles to the posh Santa Barbara Polo & Racquet Club for a charity polo game.
Later on, the duke and duchess will be guests of honor at a British Academy of Film and Television Arts dinner honoring 42 young British filmmakers and on Sunday, they will watch a dance at a nonprofit academy in the gritty Skid Row area downtown, then attend a job fair for U.S. servicemen and women transitioning to civilian life.
On Friday evening, the couple were honored at a reception at the consul general's home attended by such British notables as David Beckham and humorist Stephen Fry. Several news vans and bystanders were positioned across the street from the residence, which was blocked off by the Los Angeles Police Department, hoping for a peek at the couple.
In Canada, the newlyweds were cheered almost everywhere they went. They celebrated Canada Day with hundreds of thousands on Parliament Hill, did an impromptu walkabout in Quebec City, raced in dragon boats on bucolic Prince Edward Island and went canoeing in the wilds of the Northwest Territories.
A much talked-about highlight was the race in Prince Edward Island when the prince's boat defeated Kate's. William's consoling hug and Kate's playful response — she shoved the prince as if to push him into the water — revealed their competitive, loving and fun side, and warmed Canadians' hearts.
There was a moment Thursday that almost amounted to a faux pas — when the young prince and his bride appeared to snub their western Canadian host by not donning white cowboy hats upon arrival at airport, a time-honored Calgary tradition. But ruffled feathers were smoothed when the royal duo turned up for a rodeo show later in full western regalia, including the hats.
William said the nine-day trip to Canada exceeded expectations and promised to return.
William's grandmother, Queen Elizabeth II, is Canada's titular head of state. Carolyn Harris, a royal historian with Queen's University, said the royal couple's visit would likely ensure the monarchy remains the head of state in Canada for years to come.
"The degree of popularity that the Duke and Duchess of Cambridge enjoy really shows that the institution really has a popular and viable future in Canada," Harris said.