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computer science

WeChat

WeChat is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand WeChat rather than just read about it. In short: WeChat (Chinese: 微信; pinyin: Wēixìn ; lit. 'micro-message') is an instant messaging, social media, and mobile payment app developed by Tencent. First released in 2011, it became the world's largest standalone mobile app in 2018 with over 1 billion monthly active users.

WeChat — main illustration
WeChat — illustration

Key takeaways

  • WeChat belongs to computer science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect WeChat to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of WeChat from memory before moving on to harder problems.

Reference excerpt

WeChat (Chinese: 微信; pinyin: Wēixìn ; lit. 'micro-message') is an instant messaging, social media, and mobile payment app developed by Tencent. First released in 2011, it became the world's largest standalone mobile app in 2018 with over 1 billion monthly active users. WeChat has been described as China's "app for everything" and a super-app because of its wide range of functions. WeChat provides text messaging, hold-to-talk voice messaging, broadcast (one-to-many) messaging, video conferencing, video games, mobile payment, sharing of photographs and videos and location sharing. It has been described as having "an almost indispensable part of life in China". To sign up for WeChat, a user may need to provide their bank card numbers or ask another WeChat user to scan their QR code. Accounts registered with telephone numbers in mainland China store data in mainland China and are governed by Weixin's terms of service and privacy policy. Non-Chinese WeChat users enjoy different, more liberal terms of service and a stricter privacy policy. WeChat users’ personal information (excluding users in mainland China) is stored in Singapore, or in Hong Kong for users in Hong Kong and Macau. WeChat users’ personal information may also be transferred to the Netherlands, Malaysia, and the United States. Personal information of international WeChat accounts can ultimately still be accessed remotely from mainland China by Tencent, and interactions between WeChat and Weixin users are subject to both services' policies. Activities on both versions may be monitored and shared with Chinese authorities on request. WeChat and Weixin censor politically sensitive topics and ban content deemed threatening to national security, social order, or state policy. Tencent regularly deletes LGBTQ official accounts without warnings. Tencent also blocks international WeChat accounts for content considered lewd material, violence, scams, rumors, or false ads. WeChat blocked or censored accounts of Americans and Canadians, many of whom were of Chinese ancestry, discussing Hong Kong. Wuhan’s public security bureau initially deemed Chinese doctor Li Wenliang’s private group chat messages in 2019 about SARS-CoV-2 as “rumors,” leading to summons and admonitions against Li, which were later revoked. Account bans can significantly disrupt users' lives in China.

History By 2010, Tencent had already attained a massive user base with their desktop messenger app QQ. Recognizing smart phones were likely to disrupt this status quo, CEO Pony Ma sought to proactively invest in alternatives to their own QQ messenger app. WeChat began as a project at Tencent Guangzhou Research and Project center in October 2010. The original version of the app was created by Allen Zhang, named "Weixin" (微信) by Pony Ma, and launched in 2011. The user adoption of WeChat was initially very slow, with users wondering why key features were missing; however, after the release of the Walkie-talkie-like voice messaging feature in May of that year, growth surged. By 2012, when the number of users reached 100 million, Weixin was re-branded "WeChat" by President Martin Lau for the international market. During a period of government support of e-commerce development—for example in the 12th Five-Year Plan (2011–2015)—WeChat also saw new features enabling payments and commerce in 2013, which saw massive adoption after their virtual Red envelope promotion for Chinese New Year 2014. WeChat had over 889 million monthly active users by 2016, and as of 2019 WeChat's monthly active users had risen to an estimate of one billion. As of January 2022, it was reported that WeChat has more than 1.2 billion users. After the launch of WeChat payment in 2013, its users reached 400 million the next year, 90 percent of whom were in China. By comparison, Facebook Messenger and WhatsApp had about one billion monthly active users in 2016 but did not offer most of the other services available on WeChat. For example, in Q2 2017, WeChat's revenues from social media advertising were about US$0.9 billion (RMB6 billion) compared with Facebook's total revenues of US$9.3 billion, 98% of which were from social media advertising. WeChat's revenues from its value-added services were US$5.5 billion. By 2018, WeChat had been used by 93.5% of Chinese internet users. In that year, it became the world's largest standalone mobile app in 2018 with over 1 billion monthly active users. In response to a border dispute between India and China, WeChat was banned in India in June 2020 along with several other Chinese apps, including TikTok. U.S. president Donald Trump sought to ban U.S. "transactions" with WeChat through an executive order but was blocked by a preliminary injunction issued in the United States District Court for the Northern District of California in September 2020. Joe Biden officially dropped Trump's efforts to ban WeChat in the U.S. in June 2021.

Features WeChat, has been described as China's "app for everything" and a super-app because of its wide range of functions. WeChat provides text messaging, hold-to-talk voice messaging, broadcast (one-to-many) messaging, video conferencing, video games, mobile payment, sharing of photographs and videos and location sharing. It has been described as having "an almost indispensable part of life in China". Due to its central part of Chinese life, a Chinese person having their WeChat account banned can cause a significant disruption to their life.

… excerpt ends here. Continue reading the full article.

Illustrations

WeChat illustration
WeChat illustration

Worked examples

Example 1 — a first encounter with WeChat

Start with the simplest possible case. Write down what WeChat claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to WeChat before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about WeChat ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of WeChat

In research
WeChat appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses WeChat in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
WeChat is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2011 software, Android (operating system) software, BlackBerry software, so understanding it makes those chapters shorter.
In everyday life
Look for WeChat outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study WeChat in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what WeChat means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain WeChat out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WeChat in simple terms?

WeChat (Chinese: 微信; pinyin: Wēixìn ; lit. 'micro-message') is an instant messaging, social media, and mobile payment app developed by Tencent. First released in 2011, it became the world's largest standalone mobile app in 2018 with over 1 billion monthly active users.

Why does WeChat matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study WeChat?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on WeChat.

Tags

  • 2011 software
  • Android (operating system) software
  • BlackBerry software
  • Chinese brands
  • Communication software
  • Delisted applications
  • HarmonyOS software
  • IOS software
  • Instant messaging clients
  • Instant messaging clients that use Qt
  • Internet censorship in India
  • Internet properties established in 2011

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