用户长期高频进行互动关注，体现用户对该公众号的忠实度。
用户交互的简单性非常重要，且对提高用户粘性有直接影响。
So the simplicity of user interactions is important; and can have a direct return in increased user engagement.
社交服务网站是用户粘性及活跃程度较高的互联网用户聚合地，其商业价值丝毫不亚于任何一种网络应用服务。
Social network service site is a Internet users 'gathering place with higher levels of stickiness and activity, and its commercial value is no less than any network application service.
门户网站试图创建他们所谓的粘性内容，以尽可能长时间地留住用户。
Portals attempt to create what they call sticky content to keep a user as long as possible.
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