The study looked at how people give to others in social networks. They found that people give more to friends than to strangers, and they also give more if they think they will interact with the person again. Giving to friends increased by 52% compared to giving to random strangers. When giving was efficient, future interaction increased giving by an extra 24%. This means that people are more likely to help friends and do favors for them, especially if they think they will benefit from it in the future. The study also found that people who are more generous themselves tend to have friends who are also generous.