Tracing the evolution of a ubiquitous online feature.
Do friends influence one another to buy products, embrace beliefs, and adopt behaviors?
Do Facebook friends really trust one another? New business models are counting on it.
Social computing is changing how work is organized and completed.
Weak signals in online dating networks inform system design.
Peer influence changes campaign outcomes.
Location-based services and unreliable user data.
What keeps users engaged in a site?