Supporters of same-sex marriage are not only taking to the streets to voice their opinion, but also online -- as a viral movement started by the organization Human Rights Campaign has spread rapidly on Facebook and Twitter.
Facebook users may have noticed friends changing their profile photos today to a red square with a pink equal sign; based on Human Rights Campaign's original blue and gold equality symbol, it stands to symbolize support for gay marriage.
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The photo of the red square on Human Rights Campaign's Facebook page had been shared nearly 45,000 times by Tuesday afternoon.
The Supreme Court will consider the 1996 Federal Defense of Marriage Act, or DOMA, on Wednesday, which limits the definition of marriage to heterosexual couples.
In a recent CBS News poll, 53 percent of Americans think it should be legal for same-sex couples to marry, while 39 percent say it should not be legal.