Jeremy points to Steven Rubel suggestion of using tags and Flickr for subscribing to product and brand awareness -
Tapping into Tags (by Jeremy Zawodny)
I've been following tag based system for a while (see my post from Nov
) but I'm not sure how they will react to spam. It looks like flickr is using voting to keep things clean, but I haven't spent much time investigating.
(Thanks for the link to folksonomies, haven't read it yet but will look soon!)