1. Semiocast, Geolocation analysis of Twitter accounts and tweets by Semiocast (2012),
http://bit.ly/1kwY9OZ
2. Farid, D.: Egypt has the largest number of Facebook users in the Arab world. Daily News Egypt (September 2013)
3. El-Beltagy, S.R., Ali, A.: Open Issues in the Sentiment Analysis of Arabic Social Media: A Case Study. In: Proceedings of 9th International Conference on Innovations in Information Technology (IIT), pp. 215–220 (2013)
4. Volkova, S., Wilson, T., Yarowsky, D.: Exploring Sentiment in Social Media: Bootstrapping Subjectivity Clues from Multilingual Twitter Streams. In: Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics, pp. 505–510 (2013)
5. Turney, P.: Thumbs up or thumbs down?: Semantic orientation applied to unsupervised classification of reviews. In: Proceedings of the 40th Annual Meeting on Computational Linguistics (ACL), pp. 417–424 (July 2002)