A tag counting experiment – one to add to the growing collection of investigations of folksonomies. The authors claim that over 60% of folksonomic tags are “factual” and therefore ripe for harvesting as metadata. They make no claims as to the accuracy of the tags, although they refer to a previous study that showed that folksonomic tags were more accurate than auto-tagging software. They chose a very specific field – CSS style sheets – but the number crunching is an impressive effort – they claim to have have checked them all! Some typos though.