For a second year in a row, the organization behind the Oscars is taking flak on social media for failing to nominate a person of colour in any of its acting categories.

Twitter users hammered the Academy of Motion Picture Arts and Sciences on Wednesday, using the hashtag #OscarsSoWhite to vent their frustrations over a lack of diversity among the nominations.

All 20 individuals nominated for acting awards are white, as are all of the nominees for Best Director except "The Revenant" director Mexican Alejandro Gonzalez Inarritu.

This marks the second year in a row that the Academy has not included a single black person in its nominations. Last year, the lack of black nominees helped spawn the #OscarsSoWhite hashtag that returned with a vengeance on Thursday.

This year, the anger stems from perceived slights to "Straight out of Compton" and "Creed."

As one individual pointed out on Twitter, the only people nominated for those movies were white. Sylvester Stallone earned a Best Supporting Actor nod for his return as Rocky Balboa, and white writers Jonathan Herman and Andrea Berloff received a Best Original Screenplay nomination for "Straight Outta Compton."

On Twitter, one woman said the Oscars are so white, "black people can't even get nominated for the movies about black people."

Several people said they hope Oscars host Chris Rock will acknowledge the disparity at some point during the awards show.

Two black actors were nominated for film acting awards at this year's Golden Globes. Will Smith was nominated in the Best Actor – Drama category for "Concussion," and Idris Elba was nominated for Best Supporting Actor in "Beasts of No Nation." Neither actor won in their category.

Much of the outrage in 2015 sprang from a perceived slight to "Selma," the civil rights-focused film from black female director Ava DuVernay.

At least one non-white person was nominated in an acting category every year from 1998-2014.