Most of these clients are cross-platform, so they are usable on operating systems which the official client does not support.
However, these implementations had only a subset of functions of the official client and therefore were limited in features.
In response to competition with other instant messengers, such as Windows Live Messenger, Tencent released Tencent Messenger, which is aimed at businesses.
Tencent QQ holds the Guinness World Record for the highest number of simultaneous online users on an instant messaging program with 210,212,085 users online on July 3, 2014.
The People's Bank of China, China's central bank, says it is investigating the possibility of cracking down on Q Coins due to people using Q Coins in exchange for real world goods.
Using reverse engineering, open source communities have come to understand the QQ protocol better and have attempted to implement client core libraries compatible with more user-friendly clients, free of advertisements.Currently, there are seven diamond schemes available: The QQ Coin is a virtual currency used by QQ users to "purchase" QQ related items for their avatar and blog.Q Coins are obtained either by purchase (one coin for one RMB) or by using the mobile phone service.In addition to text messaging, users can send each other images, videos, and audio media messages.Moreover, users can share multimedia content with all contacts through the client's Qzone interface.