Clubhouse discussion app knocked offline in China
image copyrightReutersDiscussion app Clubhouse appears to have been knocked offline in China, prompting fears it has been blocked by the state's so-called "Great Firewall".
The invite-only app uses audio rather than text to let people chat in rooms.
Until recently, it had mainly been used by tech enthusiasts in Silicon Valley - but exploded in popularity in China in recent weeks.
Unlike many Chinese apps, it is uncensored - leading to discussions around topics rarely debated online.
Chinese authorities retain significant control over what is published on the internet, censoring search results and limiting visibility of posts on many topics.
But the audio of users' chats in the Clubhouse app is not recorded, allowing some measure of privacy - something which was exploited last weekend before the apparent block kicked in.
While Clubhouse was active, it hosted the kind of conversations rarely seen online in China.
BBC reporters observing the discussions found one room with thousands of participants, from both China and Taiwan, politely discussing many sensitive topics. Beijing considers Taiwan a breakaway province, but Taiwan sees itself as a sovereign state.
The topics discussed on the app included the pros and cons of democracy; controversial policies in Hong Kong, and towards the Uighur ethnic group in western China; as well as the unification of Taiwan and China.
But participants from both sides also shared stories about visiting each others' homelands for the first time.
Its soaring popularity - and the fact that it is invite-only - led to invites being sold for up to $77 (£56) each, the Financial Times reported.
But many China-watchers listening in over the weekend questioned how long such open and uncensored conversations would be allowed to continue.
On Monday, thousands of social media users simultaneously reported the app had been knocked offline.
No official statement about the app - or its potential future in China - has yet been made.
Analysis: A delayed reaction
By Kerry Allen, China media analyst
Clubhouse will have created a headache for the Chinese censors, who aren't especially active during the annual Spring Festival holiday period.
Overseas apps are often unavailable to view the moment they start to gain momentum in China, but many China-based users were able to have conversations with people overseas for days before suddenly finding themselves unable to access their accounts.
Its momentum was perhaps unexpected: in recent years, domestic phone-makers like Huawei have surged in popularity, and Clubhouse is only available on iPhones.
It is not yet clear if Clubhouse has been blocked in China, but more than 100,000 Weibo users on Monday saw posts containing the hashtag #ClubhouseBlocked, before Sina Weibo suddenly started showing "no results" - clear evidence of censorship.
Users all over China shared pictures of their frozen accounts before government censors moved to blanket-block them.
The nationalist Global Times newspaper disputes the suggestion that the app became a "free speech heaven" for China-based users, and instead says users "expressed worries of the platform being used for anti-China propaganda".
However, it adds that "the platform is still in the early stages of development", hinting it may make a return, provided it maintains "a friendly community atmosphere".
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