For example many social bookmarking and social news sites use community sentiment and collaborative filtering to help to highlight what is most interesting, useful or important.
比如许多社会化书签和社会化新闻网站都采用社区意见和协作性过滤来帮助强调突出最有趣、最有用和最重要的内容。
In the second, the collaborative approach, actions such as ratings, bookmarking, and so forth are used to find similar items.
第二种，用复合的方法，用划分等级，标签等等用来寻找类似item。
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