It is a way of categorizing information online, where any piece of content can have multiple tags which will the appear to the user in categories.
Geo-tagging
Process of adding longitude and latitude lines, furthermore, it allows content to be displayed geographically on a Map. e.g. Flickr.com - (It allows users to share, and store photos for example)
AJAX
Stands for: Asynchronous JavaScript & XML and is a development technique for creating interactive web applications.
-it increases usability, speed and the interactivity of the site
e.g. Kayak- 100 airlines best prices combined on one web page, with the use of Ajax to provide greater user experience.
Wiki
Sites which allows the user to add, change or edit the content of a page.
Threats:
-Mistakes
-Offensive content
-Manipulation
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