A 25-YEAR-OLD woman mysteriously found in Dublin a month ago is being returned to Australia. NEW YORK - Twitter has hit Wall Street with a bang, as an investor frenzy quickly sent shares surging after the public share offering for the fast-growing social network. RAMALLAH, Palestinian Territories - Palestinian officials have demanded a global investigation into the "killing" of Yasser Arafat, after Swiss experts said test results showed moderate backing for the theory he had been poisoned. ISLAMABAD - A ruthless commander whose fighters tried to assassinate teenage education campaigner Malala Yousafzai last year has been named as the new chief of the Pakistani Taliban. LONDON - Britain's top spy chiefs say the intelligence leaks by Edward Snowden have left its enemies "rubbing their hands with glee" and caused terror groups to change the way they communicate. WASHINGTON - US regulators have taken steps to ban trans fat from processed foods like microwave popcorn and frozen pizzas, saying the artery-clogging oils are not safe for humans to eat.