A tag is a keyword linked with an element such as a website, a picture or a video, as a mean of classification. The classification system is not formal as tags are selected subjectively, from the person that creates it. This style of classification is called “folksonomy” (instead of taxonomy), in order to describe a collaborative categorization of sites, using labels and tags.

Source(s):

DEMO_net. The role of Web 2.0 technologies in eParticipation. Booklet, DEMO_net Consortium, 12 2007.

A taxanomy creates a relationship between the classification criteria, and therefore can be considered as a multidimensional space, where each crieterion corresponds to a dimension.

Source(s):

DEMO-net. DEMO-net Deliverable 5.2: eParticipation: The potential of new and emerging technologies. Deliverable, DEMO-net Consortium, 9 2007.

Text messaging is primarily known in two forms - the Short Message Service (SMS) from mobile phones, and its instant messaging (IM) counterpart from the internet. In practice the two are heavily interconnected; SMS gateways exist to connect mobile SMS services with instant message (IM) services, the world wide web, desktop computers, and even landline telephones (through speech synthesis). Text messaging is most commonly used for person to person synchronous communication, but overlaps with chat systems, where many users can participate. It is commonly found integrated with many other services, such as conference, voice and email.

Source(s):
DEMO_net. The role of Social networking software in eParticipation. Booklet, DEMO_net Consortium, 12 2007.