Augmented reality (AR) is a promising technology for improving the applicative and comprehension skills of students. The ARiSE project developed an Augmented Reality Teaching Platform (ARTP) for secondary schools. A Chemistry learning scenario was implemented that is based on the interaction paradigm "building with guidance". This study aims at assessing the extent to which specific capabilities of the ARTP support the understanding of Chemistry concepts as well as their contribution to the perceived utility. The results of a multiple-regression analysis show that the specific features of the Chemistry scenario enable students to better understand the subject matter with less effort in learning. Overall, the interaction paradigm proved to have a positive influence on the effectiveness and efficiency of the learning process.

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Facebook is a social networking website which gained a huge popularity in the last

As social network sites (SNWs) have been shown to connect individuals to people with whom they have a previously established offline connection [9], as well as to connections of different degrees of relational closeness [5], it is likely that people turn to SNWs as an efficient way to tap these connections for information-seeking purposes. These sites can be oriented towards workrelated contexts (e.g., LinkedIn.com), roman-

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