For four years, Twitter and Facebook have served as bullhorns for President Trump. Over the weekend, the companies' decision to "de-platform" the US President sparked a contentious global conversation about the role of tech giants in monitoring (or censoring) free speech online. The moves also revived debate in the US, Europe, and elsewhere about the extent to which tech companies should be subject to government regulations that would curb their ability to control markets, data, and speech. But five of the ten largest social firms aren't in countries where that debate is occurring: in China, social media companies already operate hand-in-glove with the government, and there is little prospect of that changing. Here's a look at the biggest social media companies in the world, and where they are based.