In this exploratory investigation, we examine changes associated with joining a nominal online group on longer-term behavior of lenders on the leading peer-to-peer microcredit site Kiva.org. Using a random sample of 5,000 Kiva lenders and exploiting a naturalistic field experimental manipulation...

We report the results of a longitudinal field study, conducted in cooperation with two restaurants, to examine the degree to which participating on a Facebook fan page affects customer behaviors. We assessed customers’ baseline levels of visit frequency and spending. The restaurants then set...