A. Bangor, P. T. Kortum, and J. T. Miller, An Empirical Evaluation of the System Usability Scale, International Journal of Human-Computer Interaction, vol.2, issue.2
DOI : 10.1080/10447310802205776

E. Bogdanov, F. Limpens, N. Li, S. Helou, C. Salzmann et al., A social media platform in higher education, Proceedings of the 2012 IEEE Global Engineering Education Conference (EDUCON), pp.1-8, 2012.
DOI : 10.1109/EDUCON.2012.6201105

I. Bosni´cbosni´c, K. Verbert, and E. Duval, Automatic keywords extraction -a basis for content recommendation, Proceedings of the 4th International Workshop on Search and Exchange of e-learning Materials, pp.51-60, 2010.

J. Brooke, SUS: A quick and dirty usability scale, Usability evaluation in industry, pp.189-194, 1996.

H. Drachsler, K. Verbert, O. C. Santos, and N. Manouselis, Panorama of Recommender Systems to Support Learning, Recommender Systems Handbook, pp.421-451, 2015.
DOI : 10.1007/978-1-4899-7637-6_12

S. Helou, C. Salzmann, and D. Gillet, The 3A personalized, contextual and relation-based recommender system, J. Univers. Comput. Sci, vol.16, issue.16, pp.2179-2195, 2010.

M. Erdt, A. Fernandez, and C. Rensing, Evaluating Recommender Systems for Technology Enhanced Learning: A Quantitative Survey, IEEE Transactions on Learning Technologies, vol.8, issue.4, pp.326-344, 2015.
DOI : 10.1109/TLT.2015.2438867

I. Guy, U. Avraham, D. Carmel, S. Ur, M. Jacovi et al., Mining expertise and interests from social media, Proceedings of the 22nd international conference on World Wide Web, WWW '13, pp.515-526, 2013.
DOI : 10.1145/2488388.2488434

H. Harkous, R. Rahman, B. Karlas, and K. Aberer, Abstract, Proceedings of the 16th Privacy Enhancing Technologies Symposium, PETS, 2016.
DOI : 10.1515/popets-2016-0032

J. Kim, S. Li, C. J. Cai, K. Z. Gajos, and R. C. Miller, Leveraging video interaction data and content analysis to improve video learning, Proceedings of the CHI 2014 Learning Innovation at Scale workshop, 2014.

K. Kitto, S. Cross, Z. Waters, and M. Lupton, Learning analytics beyond the LMS, Proceedings of the Fifth International Conference on Learning Analytics And Knowledge, LAK '15, pp.11-15, 2015.
DOI : 10.1145/2723576.2723627

A. Krizhevsky, I. Sutskever, and G. E. Hinton, ImageNet classification with deep convolutional neural networks, Advances in Neural Information Processing Systems 25, pp.1097-1105

M. G. Moore, Editorial: Three types of interaction, American Journal of Distance Education, vol.3, issue.2, pp.1-6, 1989.
DOI : 10.1080/08923648809526633

W. Pohs, G. Pinder, C. Dougherty, and M. White, The Lotus Knowledge Discovery System: Tools and experiences, IBM Systems Journal, vol.40, issue.4, pp.956-966, 2001.
DOI : 10.1147/sj.404.0956

R. Klamma, M. A. Chatti, E. Duval, H. Hummel, E. T. Hvannberg et al., Social software for life-long learning, Journal of Educational Technology & Society, vol.10, issue.3, pp.72-83, 2007.

J. Ramos, Using tf-idf to determine word relevance in document queries, Proceedings of the first instructional conference on machine learning, pp.1-4, 2003.

M. J. Rodríguez-triana, L. P. Prieto, A. Vozniuk, M. S. Boroujeni, B. A. Schwendimann et al., Monitoring, Awareness and Reflection in Blended Technology Enhanced Learning: a Systematic Review, International Journal of Technology Enhanced Learning

J. L. Santos, K. Verbert, J. Klerkx, E. Duval, S. Charleer et al., Tracking Data in Open Learning Environments, J. Univers. Comput. Sci, vol.21, issue.7, pp.976-996, 2015.

N. Sclater, Code of practice for learning analytics. a literature review of the ethical and legal issues, p.2014

G. Shani and A. Gunawardana, Evaluating Recommendation Systems, Recommender Systems Handbook, pp.257-297, 2011.
DOI : 10.1007/978-0-387-85820-3_8

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.600.7100

H. Thüs, M. A. Chatti, R. Brandt, and U. Schroeder, Evolution of Interests in the Learning Context Data Model, Design for Teaching and Learning in a Networked World, pp.479-484, 2015.
DOI : 10.1007/978-3-319-24258-3_43

A. Vozniuk, S. Govaerts, and D. Gillet, Towards Portable Learning Analytics Dashboards, 2013 IEEE 13th International Conference on Advanced Learning Technologies, pp.412-416, 2013.
DOI : 10.1109/ICALT.2013.126

A. Vozniuk, A. Holzer, S. Govaerts, J. Mazuze, and D. Gillet, Graspeo, Proceedings of the Seventh International Conference on Information and Communication Technologies and Development, ICTD '15, pp.63-78, 2015.
DOI : 10.1145/2737856.2737887

V. A. Zaldivar, R. M. Crespo-garcía, B. Daniel, and P. , Abelardo, and others. Automatic discovery of complementary learning resources, Proceedings of the 6th European Conference of Technology Enhanced Learning, EC-TEL, pp.327-340, 2011.