When talk of a possible registry of Muslims surfaced in the wake of the election of Donald Trump as US president, Twitter users took to the microblogging site to express their disapproval of the idea and show solidarity with Muslims using the hashtag #IWillRegister.
Muslims in America have expressed fear and disbelief over what appeared to be a shocking Trump victory on the heels of a divisive campaign.
During his campaign for president, the Republican made headlines for his anti-Muslim rhetoric and call for tighter immigration controls, drawing accusations of xenophobia and racism.
Amongst the controversial immigration policies president-elect Donald Trump has promised to implement is a "extreme vetting" of Muslims entering the United States as a national security measure.
Khris Kobach, reportedly a key member of Trump's transition team, said the immigration policy group could recommend the reinstatement of a national registry of immigrants and visitors who enter the United States on visas from countries where extremist organisations are active, such as Pakistan, Afghanistan, Saudi Arabia and Somalia.
People of all faiths on Twitter took part in a campaign hitting back against the possibility of registration of Muslims, tweeting that they would register as well in a show of solidarity with Muslims in the US.