Web tagging, community classification, non-expert indexing or crowd tagging.

All options are incorrect.

All options are incorrect.

Twingo and InTagPaper.

Inappropriate use of controlled language-based tags, which result in inconsistent labels representing information resources in the system.

A rapid increase in number and diversity of tags, including an increase of incoherent tags representing information resources in the system.

A rapid decrease in the number and diversity of tags, including an increase of coherent tags representing information resources in the system.

Appropriate use of controlled language-based tags, which are coherent and represent information resources in the system.

A professional cataloguing service that allows you to add and manage any type of resource from Google, Microsoft and software libraries. Resources are provided with personalised recommendations, rating and review and are indexed using artificial intelligence tools.

A completely free web service that lets you add and manage books, movies and music from Amazon, the Library of Congress and other libraries. Books have personalised recommendations, ratings and reviews and can be tagged by users of the service. 

A paid service that allows you to add and manage any type of document from Amazon, the Library of Congress and other websites. Documents have personalised recommendations, ratings and reviews and are classified using Library of Congress subject headings.

All options are incorrect.

y = 7.52 + 0.37 log x

y = 7.04 + 3.86 log x

y = 0.37 + 7.52 log x

y = −1.71 + 0.25 log x