The NAACP has returned a donation from Facebook and called for a daylong boycott of the social network Tuesday following revelations of how its platform was used to manipulate black voters in the 2016 presidential election.

Why it matters: It's another pressure point on Facebook, already under fire from governments, privacy groups and others.

"Over the last year, NAACP has expressed concerns about the numerous data breaches and privacy mishaps in which Facebook has been implicated," NAACP CEO Derrick Johnson said in an e-mail. "Now, the time has come for our collective actions to emulate the severity of mistrust we have in Facebook."

The move comes after a Senate report released Monday detailed how Russia's Internet Research Agency created "an expansive cross-platform media mirage targeting the Black community" with a goal of voter suppression.