The U.S. is easily in the lead with 152.2 million Facebook users, but Indonesia is ranked 2nd with 35.2 million users, and “more than half of the country’s online population participates on social networking sites” as reported by eMarketer. See the chart for the list of top ten countries ranked by the number of Facebook members (data from CheckFacebook.com).
eMarketer notes that users in Indonesia tend to use mobile to connect to social networks (as in other lower-income markets), and as a result, marketers must direct their efforts to mobile. Not surprisingly, location-based services like Foursquare and Indonesia’s own Yahoo!Koprol are growing quickly.