I use robots.txt to block tags from being crawled. I do not believe them to be seo friendly any more. I don't think any list of keywords is any good any more at least for Google seo.
I believe the tags system was mainly designed for use inside the site, not seo.
Lastly, I know you catch this stuff on GWT but I really think Google's current algo is smart enough to know the difference with this type of duplicate content. I doubt you would be "penalized" for it.
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