The focus on social games in recent years has been generated by the rising number of users of MMORPGs (Massive Multiplayers Role Playing Games) such as World of Warcraft (WoW). However, the rise of social games in social networks has also played an interesting part in social games awareness. In this paper we focus on ‘social' casual games in Facebook. Our assumption is that the success of games in the Facebook context is linked to the blending of personal and social aspects. In particular: (i) the engagement in ‘fictional' social actions, (ii) the use of asynchronous actions, (iii) the combination of public and private actions within the game. The three above-mentioned aspects contribute to the emergence of particular social groupings, very similar to Cova's tribes. In order to demonstrate the previous assertions the paper will first define a set of basic concepts and will then describe some practical examples from the Facebook context.