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The firm is by no means the only provider of such games - there are hundreds available via Facebook and they are proving one of the most shared bits of content on the social network.

In order to take part, users generally have to agree to allow the firm access to their Facebook data. Often the quiz won't work without these permissionsreneex.

Vonvon's chief executive Jonghwa Kim told the BBC that the firm uses Facebook data solely to make the quiz as good as it can bereenex cps.

"We only use your information to generate your results, and we never store it for other purposes," he told the BBC.

He also said that none of the personal information is sold on to third parties, despite this being something that it is allowed to do as part of the terms and conditions.

The terms and conditions do give Vonvon pretty free range with your data - it can, for example store information on "its servers in many countries around the world"reenex cps.