在每一个非营利组织的Facebook跟随者中，有2.5%的人每周都进行某种活动，如在留言墙上留言或者评论；
5% of each organization's Facebook fans took some sort of an action weekly such as contributing wall posts, "likes," or comments.
登录则具有较长时间的效果，并附带某种类型的上下文，像一个有状态的活动。
Login has a longer term effect and carries some type of context, like a stateful activity.
对于某种特定的技能或活动十分有经验或十分有技术的人。
One who is thoroughly experienced and skilled in a particular craft or activity.
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