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By Piya Sinha-Roy LOS ANGELES (Reuters) – There were underpants, Lego statues and a nail-biting finale on the Oscars stage on Sunday, but it was Lady Gaga's “Sound of Music” spectacular that sparked the most chatter on social media. The Oscars lit up digital platforms, with 21 million people logging 58 million interactions about the awards ceremony on Facebook Inc, according to figures from the social networking site on Monday. Lady Gaga performed a medley of hits from “The Sound of Music” and then was joined by Julie Andrews on stage for the 50th anniversary of the musical, which was talked about by 214,000 people per minute globally on Facebook, the company said.