A Twitter user in Pakistan was tweeting about the U.S. raid on Bin Laden's compound without knowing what he was tweeting about.
A user with the handle @ReallyVirtual first tweeted, "Helicopter hovering above Abbottabad at 1AM (is a rare event)."
Then about an hour after that he posted, "A huge window shaking bang here in Abbottabad Cantt. I hope its not the start of something nasty."
The tweets were from an IT consultant who lived near Bin Laden's compound. Only later did he learn what he had been tweeting about.
"Uh oh, now I'm the guy who liveblogged the Osama raid without knowing it," he tweeted .
He most recently posted messages saying that many Western media outlets are trying to contact him.
Others also took to social networking to relay the news.
Keith Urbahn, an aide to former Defense Secretary Donald Rumsfeld, tweeted "So I'm told by a reputable person they have killed Osama Bin Laden. Hot damn."
In Old Town Pasadena on Monday, some shoppers said they first heard the news through Facebook.
Michael Blanton from the city of Orange said he immediately turned to Facebook after getting a one-word text from a friend that read, "America."
"I got on their and everyone was 'Osama' this, 'God Bless America,' all that good stuff," he said.
Richard Pool of Los Angeles experienced just about the same.
"Almost every person I know had something to say about it on Facebook last night," he said.