Reddit seems to have been blocked in China, in yet another widening of the country’s “Great Firewall”.

The social news site joins most other major American web services — including Google, YouTube, Facebook, Twitter and Instagram — in being blocked from inside the country. Sites including Reddit may be accessible through virtual private networks (VPNs), but China has been cracking down on those too.

The website Blocked In China shows the site as unavailable from computers in all of the regions that are tested: Beijing, Shenzhen, Inner Mongolia, Heilongjiang Province and Yunnan Province.

On Reddit itself, some users were still able to access the site. The blocks are done in such a way that they can show initially only in some areas — but sometimes sites are blocked and then made available again without notice.

China has been gradually blocking more and more sites as part of what it calls the “Golden Shield Project”. The country says that the blocks are intended to keep dangerous content out of the country — and the block tend to cover sites that people use to talk about topics that the country doesn’t want discussed, or places that are used to share content that authorities deem obscene.