London - President Asif Ali Zardari was among individuals whose personal data was clandestinely obtained by private investigators at the behest of a newspaper owned by media baron Rupert Murdoch. Nick Davies, a journalist writing for The Guardian who has doggedly exposed the dubious news-gathering practices in the British press, mentions that Zardaris credit-card statement was obtained by a private investigator for The Sunday Times. Davies, an award-winning journalist whose revelations led to the current phone-hacking imbroglio, details several instances of unethical and illegal practices on Fleet Street in his book, 'Flat Earth News. In a revealing chapter titled 'The Dark Arts, Davies writes: One investigator described being hired by the Sunday Times to target Asif Zardari, the husband of the then prime minister Benazir Bhutto, whose credit-card statement he supplied so that Sunday Times reporters could find out where he had been staying and what he had been spending his money on. Davies does not mention the year when Zardari was targeted, but Zardari is known to visit Britain often. He reportedly owns a neo-Tudor mansion in Surrey. Meanwhile, PPP chairman Bilawal Bhutto Zardari tweeted for the first time as he joined the fast-growing social networking site Twitter on Thursday. The first tweet by Bilawal, whose handle is @BBhuttoZardari, read: @AseefaBZ how do i fix my profile picture so our faces arent cut off? This was in response to his sister Aseefa Zardaris tweet, who welcomed him on Twitter addressing him as the 'real Bilawal Bhutto Zardari. Bilawal has gained popularity within nine hours of his joining as around 421 people have begun to follow him on the site. Bilawal himself is following 22 people and has tweeted around 13 times since his arrival, most of his tweets thanking followers who welcomed him to the site. He is following prominent people on the site including Interior Minister Rehman Malik, Pakistan Ambassador to US Hussain Haqqani and Shehrbano Taseer, daughter of former Punjab Governor Salmaan Taseer. He is also following his siblings Aseefa and Bakhtawar Zardari who have been active on the site for some time now. Bilawal, who turns 23 this September, is two years away from being eligible to run for a provincial or national assembly seat.