Mark Zuckerberg, the high-profile creator and CEO of social media website Facebook, is being asked a lot of tough questions by the US government.

US Senators were asking him how Facebook uses the personal information it collects on people who use the popular social media website.

When people join Facebook and use it, they provide lots of information on themselves. Companies pay to use that information when they post advertisements.

If they have information about a person -- for instance, whether they have kids, or where they like to go on holiday -- they can do a better job targetting ads at them. That makes the person more likely to buy the product that's being advertised.

That's only one way companies use people's personal information. Other people, who may be less honest, can sometimes use personal information to try to take advantage of people.

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