Singer Lady Gaga, left, pays tribute to Julie Andrews after performing songs from the Sound of Music at the 87th Academy Awards in Hollywood, California February 22, 2015. [Photo/Agencies]

LOS ANGELES - 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.