The red equal sign that many Facebook users have been replacing their profile pictures with is part of the Human Rights Campaign’s social media effort to bolster support for gay marriage.

The Human Rights Campaign organization launched the social media initiative in the days in which the Supreme Court is hearing arguments pertaining to California’s Proposition 8 and the Defense of Marriage Act (DOMA). The simple logo is a pink equal sign over a red background. In addition to changing Facebook and Twitter avatars, the HRC is calling on marriage supporters to “paint the town red” by wearing red clothing.

“HRC envisions an America where lesbian, gay, bisexual and transgender people are ensured equality at home, at work and in every community,” reads the HRC Facebook page. “By inspiring and engaging all Americans, HRC strives to end discrimination against LGBT citizens and realize a nation that achieves fundamental fairness and equality for all.”

So far, 13 members of Congress have replaced their social media profile photos with the HRC “=” logo, according to journalist Ryan Beckwith.

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