Americans are keeping in touch through the social media as the superstorm wreaks havoc, reported USA Today.
#Sandy has had more than four million mentions by almost 400,000 unique sources on Twitter, said Radian6 that tracks social media use.
The site said that mentions of #Sandy have had a potential reach of more than 3 billion Twitter followers.
"Hurricane Sandy" was the top phrase on Facebook in the US in the past day, the media report said.
The other top 10 terms included "stay safe", "storm", "East Coast", "my friends" and "prayers".
Twitter and Facebook became a key way for friends and family to check in on each other.
"Sending my thoughts to all in the path of #sandy... looks pretty bad," read a tweet.
People posted updates.
"Eerie, flooded streets in Atlantic City, two hours after landfall. No wind and only a light rain falling. #sandynj," wrote @aubreyjwhalen.