Tags at Hacker News
RiderOfGiraffes: There is an external implementation of tags, although most likely it hasn't taken off because no one uses it, and no one uses it because it hasn't taken off.http://news.ycombinator.com/item?id=1069726PG is talking about having multiple flags for items, but that's about appropriateness, not about the semantics of the content:http://news.ycombinator.com/item?id=1006589The problem is always getting the elvel of complexity right.  Allowing free-form tags makes it impossible to search for what you want, and makes it hard to decide what tags to make up and apply.  Having a limited collection makes it impossible for some submissions to decide what tags to apply.It's hard, but not impossible.  It would also prevent me from seeing some of the things I've really appreciated.  I would tend to skim over things that don't appear relevant, and sometimes those are the very things that have engaged my interest and expanded my horizons.It's like with these dating agencies, or friend suggesting algorithms.    I don't want to meet people with whom I share an interset - I want to meet people who are interesting.Solve that, execute well, and you'll make a fortune.