In one sense, the activities are short-term in the sense of being aboutparticular product at a particulartime, but relational in the sense that the network itself is long lived.
Based in San Francisco, closely held Strava is also used by runners, who can win a CR course record for posting the fastest time on a particular segment. (About half of Strava runners are women.) The site charges a fee for premium services such as analysis of heart-rate data.