The boss of Facebook says he accepts tech giants may have to pay more tax in Europe in future and recognises people's "frustration" over the issue.
Mark Zuckerberg also said he backed plans by think tank the Organisation for Economic Co-operation and Development to find a global solution.
Facebook and others have been accused of not paying their fair share of tax in countries where they operate.
But some say the OECD is moving too slowly towards its goal of a 2020 deal.
