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Social network sites (SNS) like Facebook allow users to add friends from a variety of contexts to a single general-purpose social network. The variety of friend types that gather on the site can lead to context collapse where connections from a variety of context are grouped in a single collection. This research examines the friend types who are commonly unfriended and examines two particular friend types in detail to determine differences between these types of friends and the general population. The most common type of friend who is unfriended is the high school friend (18.6%), followed by other (uncategorized), friend of a friend, and work friend. These four friend types account for the majority (53.7%) of unfriending decisions. High school friends are unfriended for making online posts that are polarizing and for posting too frequently about unimportant topics. Work-related friends are commonly unfriended for engaging in disliked offline behavior and are not typically unfriended for their posting behavior.
Christopher Sibona (Wed,) studied this question.