The final act of the year’s biggest pop culture sensation will not be seen on TVs, beamed out to multiplexes or heard much on the airwaves. Well, at least not in America. The phenomenon of Susan Boyle, seen by millions of Britons on ITV’s “Britain’s Got Talent,” has been a worldwide digital storm played out in sporadic installments on the Internet. Videos of her first performance in April — “I Dreamed a Dream” from the musical “Les Miserables” — have been watched more than 220 million times, according to Internet video research firm Visible Measures.
