It's just the ridiculous amount of stuff that gets written on any hot topic (like Folksonomies, for example.) If you want to contribute a half-intelligent idea to the debate, the number of links to follow and essays to read is very intimidating, and certainly the odds of uttering an original thought approach zero. So I'll stop here.
Too much information!
It's one thing to be interested in blogs so you can read and learn and become aware of new ideas. But when it comes to joining into the discussions, watch out! No it's more than the well known problem of following discussion threads across blogs.