Here’s why #OscarsSoWhite is trending

The hashtag first surfaced after the 2015 Oscars nominees were announced.

The films and categories represented in the awards show were extremely diverse. But the actors nominated for awards weren't.

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Now, in the wake of the release of actors and actresses to be considered for accolades at the 2016 Oscars, #OscarsSoWhite is trending again.

Will Smith, who earned a Golden Globes nomination this year for his role as Dr. Bennet Omalu in “Concussion,” wasn’t among the 2016 Academy Awards nominees announced Thursday morning.

Sylvester Stallone, who claimed a best supporting actor Globe trophy for his role in “Creed,” is up for a similar Oscar. The movie’s black star and director, Michael B. Jordan and Ryan Coogler, were not among nominees for either a Golden Globe or Oscar.

Idris Elba was up for a supporting-actor Globe for “Beasts of No Nation” but received no Oscars nod.

Most social media users, which spanned many races and ethnicities, expressed shock and disappointment that "Creed" and "Straight Outta Compton," both of which topped box office sales, did not yield any award nominations for actors of color.

The most recent black actor to win an Academy Award was Lupita Nyong, who played a slave in 2013's "12 Years a Slave." The first was Hattie McDaniel, who also played a slave for her role in 1939's "Gone With the Wind." Only one Latino actor has won best actor for a lead role, and no Latina actress has ever won best actress for a leading role.