Computer games are an increasing part of life for large parts of the population. Ranging from long-lasting sessions to short interactions, stand-alone games or coupled with social networking, and offereing different types of challenges many game genres can be defined. In this chapter we focus on games played online or out-of-game interaction expressed online and introduce methods to study both. Online data connected to game play can be used for analysis of e.g. interaction patterns, discussions on gameplay, in-game events including social behaviour, and discussions of games in general. We describe aspects of different types of out-of-game data available online and what questions research are addressed using these. We also discuss the use of collaborative environments in organizational settings which shares some of the characteristics of online gaming research. We conclude by giving an example of a research game – where the game itself is a research tool to elicit data.