Estimation of Tags via Comments on Nico Nico Douga

In this paper, we propose a method that estimates new tags from user comments on videos on the Nico Nico Douga website. On Nico Nico Douga, users can post tags and comments on videos. However, users cannot post more than 12 tags on a video, therefore, there are some important tags that could be posted but are sometimes missed. We present a technique to acquire some of these missing tags by choosing new tags that score well in a scoring method developed by us.