Mining User Generated Content

User Generated Content Search 187

Possible next research steps in this direction include investigating the effect

of outdated collections upon tag-PRF in a more principled way or how to refine

the PRF weighting proposed in this chapter by integrating statistical estimates

of the similarity between the query and a tag. Another future research question

of interest is to apply tag-PRF to multimedia IR, where the data contains little

textual information. In that case, tags could be a way to boost the textual

description of the informative content.

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