A social culture visa is for those who are visiting Indonesia for travel, short courses, meetings, volunteer programs, sport activities (like diving, surfing) visiting family and any other related social activities.
With this social visa (social and cultural visa B-211) you can enter Indonesia once, and stay up to 30 days. The social visa can be extended while you are in Indonesia 2 x times (each time for 60 days), in total you can stay up to 150 days.