In which city is Facebook's European headquarters located?

Facebook’s European headquarters is located in Dublin, Ireland. Facebook announced in October 2008 that Dublin would become the centre of its international operations.

The Irish base supported technical, sales and operations work across Europe, the Middle East and Africa. Facebook opened its first Irish office in 2009 with a small team, then expanded substantially in Dublin’s Docklands and later at a larger campus in Ballsbridge. The Irish operation became particularly important because Meta’s Irish subsidiary handled much of the company’s international business and European data relationships.

Dublin is sometimes confused with London because Facebook has a major UK office and later established a London headquarters. It is also distinct from Menlo Park, California, which serves as the company’s U.S. headquarters. The question asks for the city, so “Dublin” is the essential answer; “Ireland” identifies the country.