Tag Expansion Using Friendship Information: Services for Picking-a-crowd for Crowdsourcing

To address self-tagging concerns, some social networks’ websites, such as LinkedIn and Sina Weibo, allow users to tag themselves as part of their profiles; however, due to privacy or other unknown reasons, most of the users take just a few tags. Self-tag sparsity refers to the problem of low recall obtained when searching for people on systems based on user profiles. In this paper, we use not only users’ self-tags but also their friend relationships (which are often not hidden) to expand the tag list and measure the effectiveness of different types of friendship links and their self-tags. Experimental results show that friendship information (friendship links and profiles) can effectively improve the performance of tag expansion, especially for common users who have limited followers.

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