social participation and support, we define three categories of LOW,MEDIUM and HIGH social capital.For each of this category, we define six measurable aspects: • Social participation: number of groups joined, number of posts written, number of comments made. • Social support: number of friends, number of comments received, number of followers. We thus have 18 cohorts to study—3 categories of social capital, and in each, 3 measures of social participation and 3 of social support.Usingadatasetofmorethan1.6millionusersinLiveJournalover10years,weexploreacrossallmeasuresofsocial participation and social support: (a) distribution of mood over LOW, MEDIUM and HIGH social capital; (b) distribution of mood swings in LOW, MEDIUM and HIGH social capital; (c) Moodswingfactorsthatarecommonanddifferentforcohorts. From more than 1.6 million users, we extract relevant subsets of social capital cohorts for LOW, MEDIUM and HIGH, resulting in 90,000 users. We show through our analysis that cohortswithlowersocialcapitalwhencomparedtocohortshigher social capital will have: • More negative moods, and lesserpositive moods; • More mood swings, and more mood swings to negative moods; • More underlying factors composed of negative mood swings.