How a Single Email Sparked WeChat: The 10‑Year Journey from Code to 1.2 B Users

On the early morning of November 23, 2010, a group of young developers in Guangzhou typed the first lines of code for what would become WeChat.

That modest backend code marked the birth of a platform that would eventually serve more than 1.2 billion users worldwide.

Initially, WeChat resembled a simple SMS replacement and attracted little attention.

The turning point came in May 2011 when voice chat was added, triggering explosive user growth.

Subsequent features such as “Shake”, “Drift Bottle”, “Nearby People”, “Moments”, video calls, public accounts, mini‑programs, games, and video channels were introduced, each fueling further expansion.

By the end of 2011, daily new users exceeded 100 000 and total users surpassed 50 million; by 2012, Moments reshaped social interaction, and video calls enabled face‑to‑face communication.

WeChat’s ecosystem continued to grow with payments, smart‑life solutions, mini‑programs (2017), and short‑video “Video Channels” (2020), cementing its position as a national‑level application.

Behind this success is product manager Zhang Xiaolong, who, after leading QQ Mail to the top domestic position, drew inspiration from the simple messaging app Kik and proposed a similar product to Pony Ma.

He emphasizes that great ideas often appear suddenly, as if “God programs them into your mind at the right moment.”

Zhang’s focus on user experience, relentless iteration, and willingness to experiment—evident in features like “Shake”, “Drift Bottle”, and “Jump” game—have kept users engaged.

Today, WeChat stands as a cornerstone of Chinese and global social media, influencing daily life for over a billion people, all stemming from that humble line of code written a decade ago.