WeChat has almost 1 billion active user, operating any system to support customer base that big requires innovations and inventions at various levels. for examp

WeChat has almost 1 billion active user, operating any system to support customer base that big requires innovations and inventions at various levels. for example, WeChat group published quite a lot high quality papers regarding their backend systems, the latest one probably being the VLDB 2017 paper on their PaxosStore capable of handling billions of strong consistency queries a second. This puts WeChat at the same level of Facebook, twitter, etc regarding innovation/invention.