Tweet by tweet, profile picture by profile picture, a new online campaign is taking shape to protest Donald Trump’s election victory.

Twitter users devastated by the outcome at the polls are changing their profile pictures to plain black squares, in what’s being called the #TwitterBlackout. They describe it as a show of unity, not to mention a fitting symbol of the dark mood many were feeling after Hillary Clinton’s defeat.

On Twitter, Clinton supporters Lady Gaga and Katy Perry helped spread the word.

#TwitterBlackout #NotMyPresident LGBTQ+ lives matter

Muslim lives matter

Women need equal rights

Black lives matter

Latino lives matter pic.twitter.com/RFNHl6LAD2 — Lady Gaga (@KingLadyGaga) November 9, 2016

Fight for what is RIGHT. — KATY PERRY (@katyperry) November 9, 2016

The black squares often go hand-in-hand with hashtags #NotMyPresident and #ImStillWithHer, other statements of solidarity that have been trending among Clinton supporters.

#twitterblackout isn't about changing the fact that Trump was elected. It's a statement to show the unification of ppl that know it's wrong. — Kailee (@K_Kailee) November 9, 2016

Clinton herself did not give in to such negative talk and imagery in her concession speech Wednesday afternoon.

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“Donald Trump is going to be our president,” Clinton told supporters at the Wyndham New Yorker Hotel. “We owe him an open mind and the chance to lead.”