I can't tell if it's witty or cliche to close out a post with a hashtag. #ivoteforcliche

This NYTimes article on hashtags didn't really clear things up for me:
http://www.nytimes.com/2011/06/12/fashion/hashtags-a-new-way-for-tweets-cultural-studies.html?pagewanted=all

Hashtags: are they overused on Twitter? And what's your take: witty or cliche?