Social identity theory states that our identities are formed through the groups to which we belong.
社会认同理论说明，我们的身份是由我们所属的群体塑造的。
2
A 2010 paper showed that the online groups to which people belonged could be used to infer their real identity in 42 percent of cases.
2010年的一篇文章显示，在42%的情形下，人们会因为自己参加的网络小组而暴露自己的真是身份。
3
These seven building blocks--identity, presence, relationships, conversations, groups, reputation and sharing--provide a good functional definition for social software.