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Gas is a graffiti artist in the western Chinese city of Chengdu.

Today he's painting a door in an old factory which has been converted into an art zone.

When he finishes, he'll post the pictures to his fans on Sina Weibo, China's equivalent of Twitter.

Gas is part of a new generation in China eager to express themselves.

And the internet is the perfect platform.

I'm Duncan Hewitt and I'm in China to look at how Weibo and social media are bringing change to this vast nation.

The graffiti art is in its very early stages in China.

And actually, a lot of people's work are quite simplistic.

They tend to have an impact.

But there is not very much deep thought involved.

But in 10 years or so, it will develop into something much more meaningful into a golden age of graffiti art.

Gas's signature image, the Chinese character Qi, means air and the energy of the body.

And graffiti is certainly bringing a new energy to Chinese cities.

I've lived in China for the last 15 years.

And until a few years ago, I barely saw it.

Now it's appearing on walls, on train carriages.

It's a symbol of a new urban youth with its own subcultures and individual attitudes.

And even though police often scrub his graffiti away, gas isn't deterred.

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