The need to understand the fabric of relationships that are building up on the World Wide Web calls for the application of tools that allow one to extract the underlying knowledge. Some of the most interesting relationships are those that are brought to light by co-linking analysis (the Web analogue of cocitation analysis). We here propose such an analysis based on the co-links that are generated within a closed web environment, using multivariate statistics (Principal Component Analysis, and Multidimensional Scaling) and a connection-based technique (Kohonen's SelfOrganizing Maps). An application was made to a generic thematic environment, and the underlying relationships and structures were manifest in the interpretation of the results.

There have been many attempts to evaluate Web spaces on the basis of the information that they provide, their form or functionality, or even the importance given to each of them by the Web itself. The indicators that have been developed for this purpose fall into two groups: those based on the study of a Web space's formal characteristics, and those related to its link structure. In this study we examine most of the webometric indicators that have been proposed in the literature together with others of our own design by applying them to a set of thematically related Web spaces and analyzing the relationships between the different indicators.

Purpose The purpose of this paper is to analyze the type of content disseminated by school libraries through social media and what topics are the most commonly used, to discover if, in addition to topics concerning libraries, information with a wide social scope is also disseminated. Design/methodology/approach This paper reviews the use of social media as well as the implementation of a content analysis on the most used 2.0 platforms, to locate which content is the most relevant in the school libraries of public secondary schools in Extremadura. Findings In the Extremadura region of Spain, the results of the 752 publications posted during the period 2014-2017 by the libraries of the 86 public secondary schools on six selected social media platforms generated a total of 4 categories and 14 subcategories, and point to a predominance of topics related to encouraging and promoting reading and writing, and to the library’s support function for both the classroom and the school. However, shortcomings are detected in content related to social aspects of special interest, such as bullying or education in equality. Originality/value The originality of this paper lies in the fact that although there are some works on the analysis of the content of the social web of libraries in general, especially university libraries, the same does not apply to the evaluation of social media in school libraries, and much less about the analysis of social media content in these types of libraries.

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