Human Rights Campaign logo turns pink and red for same-sex marriage YOU might stumble across this image in your online travels today and wonder what all the fuss is about. Let news.com.au explain. The red and pink logo of The Human Rights Campaign, America's largest civil rights organisation, has swamped social media after the Supreme Court of the United States has embarked on one of its most important civil rights decisions of our time (more on that later). The Human Rights Campaign Logo scoring shares on social media. The logo, launched Monday afternoon when the organisation changed its Facebook profile picture from its iconic blue and yellow logo to the current version, is filtering through social media feeds across the globe and citizens worldwide are listening, speaking and sharing. "Red is a symbol for love, and that's what marriage is all about," Human Rights Campaign spokesperson Charlie Joughin told MSNBC.com on Tuesday. We wanted to give people an opportunity to show their support for marriage equality in a public and visible way. Mr Joughin said the logo had been seen by more than nine million people and shared over 77,000 times since it was uploaded. Facebook users had shared the logo more than 100,000 times as of 4pm in the states yesterday. "We never expected anything like this - for it to go viral," he said. So we're excited. But more importantly, we're excited that the public support for marriage equality has been so great. In a nutshell, the Supreme Court of the United States has begun hearings on two key laws that could redefine marriage across the United States. The first concerns the approval of California's Prop 8 bill and what some believe is a breach of the constitution; allowing voters the right to the 2008 ban on same-sex marriage. The California Supreme Court had previously ruled in favour of same-sex marriage, but later that year voters in the state approved the ban by a 52 per cent majority. Now the Supreme Court needs five votes out nine to decide whether Prop 8 is "constitutional." Oral arguments have closed and predictions are mixed, with Justice Anthony M. Kennedy, thought to be the key vote, expressing that the court was in "unchartered waters." The nine-judge bench gave few clues over which way the court will lean. You want us to assess the effect of same-sex marriage. It may turn out to be a good thing. It may turn out to be not a good thing," Justice Anthony Alito said. AUDIO: Listen to the oral argument for the Proposition 8 case from the Supreme Court of the United States The second is the Defence of Marriage Act, a federal law signed in 1996 by then-President Bill Clinton which defines marriage as an act between a man and a woman. Clinton has since called for it to be struck down. "When I signed the bill, I included a statement with the admonition that "enactment of this legislation should not, despite the fierce and at times divisive rhetoric surrounding it, be understood to provide an excuse for discrimination,'" Clinton wrote in an opinion piece for the Washington Post. Reading those words today, I know now that, even worse than providing an excuse for discrimination, the law is itself discriminatory. It should be overturned. That case will be argued on Wednesday but it could take months to issue a ruling on both counts. Currently, Connecticut, Iowa, Maine, Maryland, Massachusetts, New Hampshire, New York, Vermont and its capital, Washington DC, allow same-sex marriage. It is forbidden or restricted in 41 others. According to the Pew Research Centre, 49 per cent of Americans are in favour of same-sex marriage. There are an estimated nine million gay, lesbian, bisexual, transgender Americans, according to a 2011 UCLA study. The US Supreme Court is treading cautiously as it considers a verdict on gay marriage in America.