Here in China more and more content is made unavailable in result of the Great Firewall of China which have been perfected during the last 10 years of its use. The latest news report that GMail now is blocked, but also other big services like HSBC were blocked as recently as in November 2014. There are many techniques to get past the Chinese firewall as well as any other similar blockades, but the easiest way is to use a professional VPN. Not only does a VPN allow you to unblock websites, but it also encrypt your Internet communication making it virtually impossible to listen in to. This is especially a good solution if you are using a lot of open WIFIs like the ones you find in cafes or airports. Without a VPN any computer talented person can easily listen in on all of your Internet use and see which websites you are using, get your passwords and much more.
The VPN which I have tested and that works fine in China is Private Internet Access which cost only $3 per month for a professional and safe solution that you should consider using even if you are not in China but are worried about Internet security. You can even use one single license on up to 5 computers and mobiles, which makes the price even more incredible. Follow this link for more information.
Another useful thing is that after installing a VPN you can choose which country it should look like you are browsing the Internet from. This allows you to access locally protected media, for example news channels or video sites which are only available from certain countries. Read more about the uses of a VPN [in swedish]
Here is a list of some of the biggest online services blocked in China at writing moment: