Tags matter for social reasons. They allow the grassroots to create the way in which stuff is classified, instead of having to file things in pre-built categories. But the words we use to tag things depend on our intentions and our social context. Find people who tag items the same way as you do and you've now found a social group based not around shared interests but around shared wayas of thinking and shared ways of speaking: Communities of tags.By their tags shall ye know them (social_tools)
Покажи мне свои метки, и я скажу, кто твой друг.