Provide pre-existing offline community with a complementary online service.
向已存在的实体社区提供辅助的网络在线服务。
Facebook made important product decisions that ensured harmony and trust between the offline community and the online service created.
Facebook作了很重要的产品决策，保证实体社区和在线服务之间的协调和信任。
These measures aim to make users feel that the site is exclusive and limited to members in their offline community (colleges and universities).
这些措施的目的是让用户感到网站是排外的，仅限于他们实际所在的社区(学院或大学)内部的人员。
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