"If I get my friends to use Flickr, it gets better for me and for them. (...) Latest things matter. There are lots of interesting slices that can be taken. Slice by user, time, tags, location, relationship to other tags, "interestingness"."
" (...) less than 1% of queries even use more than a single tag. (...) Tagging is mostly (...) a way for people to recall things, what they were thinking about when they saved it. Fairly useful for recall, OK for discovery, terrible for distribution (...)