4. The non-transitory computer-readable storage medium of claim 3 , wherein calculating the consistency level comprises calculating a deviation of the plurality of relevance ratings of the particular metadata tag.
3. The non-transitory computer-readable storage medium of claim 1 , the method further comprising: calculating a respective consistency level of relevance ratings of each of a plurality of metadata tags submitted by users in the user community; and identifying controversial metadata tags using the consistency levels of the relevance ratings of the metadata tags.