The term mash-up refers to a new breed of Web-based applications created by hackers and programmers, to mixing at least two different services of disparate or even competing websites. A mash-up, for example, may overlay traffic data from one source in the Internet over maps from Yahoo, Microsoft, Google or any content provider.

See also: Technologies/Web 2.0 principle

Source(s):
DEMO_net. The role of Web 2.0 technologies in eParticipation. Booklet, DEMO_net Consortium, 12 2007.

Metadata are “data about data” or “information about information” and are used to facilitate the understanding, use and management of any web resources such as data, graphics, documents, videos, software etc. Metadata are specifically important to facilitate and improve searching in the web.

Source(s):

DEMO_net. Interoperability requirements and standards in eParticipation. Deliverable, DEMO_net Consortium, to appear in 2008.

In chat rooms and online forums moderation is often used to control any disruptive behaviour. E.g. forum entries are only visible for others, if they are reviewed and released by the moderator of the forum.