Open Data : data freely available to everyone , Open Metadata
Web 3.0 : attract Web 2.0 people, Future of Internet
Linked Data : data integration technologies based on RDF, Linked Open Data
Semantic Web : integration and combination of data; interoperability framework, Web of Data
But there are some barriers to solve it : Scalability, Privacy, Licencing Models and Business Models&Use cases
from 3rd Vienna Semantic Web Meetup.