"Either @rupertmurdoch is genuinely now on Twitter, or some disgruntled ex-NOTW journo just won the hacking Olympics." Within minutes the Wendi Deng account, which has not yet been verified and may not be genuine, continued: "EVERY1 @rupertmurdoch was only having a joke pROMSIE!!!" Minutes later: "explaining to @rupertmurdoch about being careful with humor on line. sometimes it comes out as rude!" About five hours later Mr Murdoch revealed his Twitter profile was causing people close to him some angst. "I'm getting killed for fooling around here and friends frightened what I may really say!" he wrote.

The decision of the octogenarian billionaire to embrace Twitter has been greeted with surprise by many, given his previous view of the internet as the home of "porn, thievery and hackers". However, his first attempts to use the social-media website suggest may still be about getting the hang of it, with misplaced full stops and strange syntax abounding. And it appears that he has also yet to win the love and adoration of some Twitter users - known as "tweeps" - with many expressing a range of emotions about his presence in tweets. Former British deputy prime minister John Prescott was one of the first to welcome Mr Murdoch to the Twittersphere, adding: "I've left you a Happy New Year message on my voicemail." "The first 30 tweets from @RupertMurdoch are free, then the paywall goes up," wrote the owner of a Murdoch parody account, @RupertMurdochPR.

Joining Twitter would be the strongest sign yet that Mr Murdoch has moved away from what was previously a strongly held antipathy towards the web, which has caused massive profit slumps in traditional media. In a 2009 article in Vanity Fair, Murdoch biographer Michael Wolff wrote that the mogul viewed the internet as "predatory", stating: "For him it's a place for porn, thievery, and hackers." That year, Mr Murdoch warned investors at the annual Sun Valley media and technology conference to "be careful" of investing in Twitter, which he reportedly said had yet to show it could provide a sustainable revenue stream. For that and other reasons, many assumed at first that Mr Murdoch's account was a hoax and the media mogul was not genuinely behind the account. The account has been "verified" by Twitter and one of the website's co-founders, Jack Dorsey, greeted him in a message on the site.

"With his own voice, in his own way, @rupertmurdoch is now on Twitter," Mr Dorsey said. Within 48 hours hours of the account being created Mr Murdoch, the chairman and chief executive of News Corporation, had close to 40,000 people following his tweets. He ruminated on Saint Barthelemy - "too many people. Thoughts best kept private around here. Like London!" - and the recently published biography of Steve Jobs - "interesting but unfair. Family must hate." He also gave his support to Rick Santorum in the upcoming Iowa presidential primary. He also plugged two Fox movies and revealed his new year's resolutions: "try to maintain humility and always curiosity. And of course diet!"

His wife appeared to receive several message telling her the man who tried to hit Mr Murdoch with a cream pie during his testimony at the British phone hacking inquiry last year, Jonathan May-Bowles, was also on Twitter. "Thank you for messages telling me the man with the pie who attacked my @rupertmurdoch is on twitter but I dont want to know more," she replied. Mr Murdoch has so far subscribed to the tweets of only four people: Mr Dorsey, Silicon Valley entrepreneur Mark Pincus, Google co-founder Larry Page and Lord Sugar. Greetings from the Twitterrati "Great that @rupertmurdoch has discovered all you need is 140 characters instead of 140 newspapers."

"Welcome to Twitter ... @rupertmurdoch - I've left you a Happy New Year message on my voicemail." "Really hoping this isn't some try-before-you-buy deal." "I'm waiting for @rupertmurdoch to inform us which tweet is the most humble in his life." Loading "Hey check it out, Monty Burns is finally on Twitter! Wait, what?"

"Either @rupertmurdoch is genuinely now on Twitter, or some disgruntled ex-NOTW journo just won the hacking Olympics." This tweet refers to the News of the World, the paper that Mr Murdoch closed down following the hacking scandal.