Web 2.0 may have emerged from a slow-gathering wave of hype, but it describes a range of business models, ideas, methodologies and computing platforms that represent a sea change in the business world - partly driven by the ways consumers like to communicate and consume. The Web 2.0 economy is no longer about where information or service originates (i.e. who it belongs to) but how easily it can be consumed, personalised and shared by a target community, outside of the strictures of format, date, ownership and hierarchy. Every stream of information means defining a community, and then satisfying its demands with supplementary information and the opportunity for conversation. Social bookmarking services such as Delicious, Digg it, Reddit, Stumbleupon and MyStrands either aggregate feeds or allow users to leave a trail of recommendations for others to follow, use, annotate and expand. read less