Photon is a multiplayer-game development framework that is fast, lean, and flexible. Photon consists of a server and client SDKs for all major platforms. The Photon Cloud is a fully managed service of Photon Servers. Exit Games is running them in several regions, ready to use instantly.
The Corona Photon plugin provides a simple to use Lua API to find games, communicate with other clients through Photon Cloud or Photon Server, and a lot more.