I have nothing against hashtags in theory - they are a great way to distinguish tags. And I love tagging - in fact I have tagged 1000 articles with my tag "net news" for bookmarking on Delicious and to share the stories I find particularly interesting and useful about Internet and digital media. These items are then displayed on the left of this blog (----> check them out ---->).
The thousandth article tagged was a story highlighting Justin Timberlake and Jimmy Falon's parody of insane tagging practices on social media. Their video really describes one of many reasons why I dislike Twitter.