- Online Communities
It is estimated that there were over 1.70 billion Internet users globally in 2009 (Pingdom 2010). The expansion of the Internet has resulted in an increase in the usefulness of computermediated communication (CMC) and the popularity of online communities. One in four Internet users has participated in chat rooms or online discussions (Madden and Rainie 2003). Just on the social network site Facebook, there are around 350 million users, and 50% of these users log in everyday (Pingdom 2010).