Vanderwal nicely captures the spirit of tagging both for personal use and for the social aspects of it.
- capture - share
- hook/copy - point
- annotate - collaborate
- refind - filter
- privacy - trusted groups
Tagging Today & Tommorw - New Content, on the page 32
Anyway, the slides are worth taking a look. I'm glad he mentions "i" word - interoperability :)