How humiliating: You tried to send a direct message to a member of your Twitter coterie but couldn't because they quit following your tweets. Should you repay the snub by unfollowing your former follower? Not so fast. The relationship may yet have value. ■ Social psychologists classify mutually beneficial relationships as either communal or exchange. In a communal relationship, participants are concerned with one another's welfare-think of family and close friends. An exchange relationship is all about what you get out of it, the kind of amicable alliance one forges with a client or bartender.
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