How a Single Email Sparked WeChat’s Rise to 1.2 Billion Users

The Birth of WeChat

On the early morning of November 23, 2010, a group of young engineers in Guangzhou typed the first lines of code for what would become WeChat, a simple messaging service that initially resembled a SMS replacement.

That modest code marked the beginning of a communication revolution that would eventually reach more than 1.2 billion users.

Zhang Xiaolong’s Email and the Launch

According to Zhang Xiaolong, a pivotal email he sent to Pony late one night launched the WeChat project. He later recalled that without that email, another team might have built a different product.

Before WeChat, Zhang led Tencent’s QQ Mail project, where he experimented with features like “drift bottles” and “reading space.” Inspired by the mobile social app Kik, he proposed a similar product to Ma Huateng, who approved the idea immediately.

The first version of WeChat was released shortly thereafter, despite early skepticism and myths about a “sweeping monk” inspiration.

Iterative Updates: From One Line of Code to 1.2 Billion Users

Initial releases attracted little attention, as the app was merely a text‑messaging alternative. Growth surged after the May 2011 voice‑chat update, followed by features such as “Shake,” “Drift Bottle,” “Nearby People,” and “Moments” in 2011‑2012.

Key milestones included:

April 2012 – introduction of “Moments,” reshaping social sharing.

July 2012 – launch of video calls.

2012 – public platform for official accounts, fueling the rise of self‑media.

2013 – emoji store, game center, and QR‑code scanning enhancements.

March 2014 – WeChat Pay and the “Smart Life” solution.

January 2017 – debut of Mini Programs.

December 2017 – release of the “Jump Jump” mini‑game, sparking a gaming boom.

2020 – addition of “Video Channels” amid the short‑video wave.

Each feature iteration kept users engaged and expanded the platform’s ecosystem.

Zhang Xiaolong: The Product Manager Behind WeChat

Within Tencent, Zhang is nicknamed “Buddha‑like” for his focus and mastery, exemplified by his high score in the “Jump Jump” game.

Unlike many engineer‑managers, he balances technical depth with a strong emphasis on user experience, believing that great products treat users as users.

His philosophy—“many ideas appear suddenly, as if a higher program places them in your mind at the right time”—guided WeChat’s continuous refinement.

Today, WeChat dominates social software in China and globally, its rich functionality shaping the daily lives of over a billion people, all rooted in that humble code written a decade ago.

Illustrative Images