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Most online social networking services provide a feature for users to build interest groups. Based on the profiles and behavior data, web services can assist users to join groups by recommending relevant interest groups. In this paper, the authors propose a novel method to connect users across multiple services based on user-labeled tags. Tags represent interests of a user and have advantages in terms of privacy, up-to-datedness, and service coverage. They have collected tags from six popular web services, and analyzed usage patterns. They observe that the popularity of tags is highly skewed and dependent on the web services. They have also found that a set of tags of a single user frequently changes over time.
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