I saw that there's a lot of Stack Exchange sites, each one that evolves around a certain study subject, a lot of experienced users on these sites can gain reputation by showing off and helping people with their knowledge about that specific subject.
So I was wondering, would it be a good idea to mention in my resume/CV the reputation in those Stack Exchange sites if its related to the area Im applying?
Could this mention be used as a diferential or it would be something bad seen and interpreted as a "filler" on my resume?