The Introduction is a brief opening to what Flickr offers to it's members and the options that a member has to fool around with their photos.
While discussing the Groups that can be made in Flickr; there is discussion of the online communities that can emerge out common interests and threads.
Sharing sessions discusses online community in more detail, giving you more of a background of the virtual world in Flickr; also evaluating how people establish credibility in this community.
Identification with Groups in Flickr is defined by what brings people in these groups together. Flickr's online community is defined and dissected.
Define Folksonomies and discuss the Shift of Power in Flickr's communities.