1. Number of social network users worldwide from 2010 to 2019. http://www.statista.com/statistics/278414/number-of-worldwide-social-network-users/.
2. The first lessons of Tunisian cyber-revolution. http://www.golos-ameriki.ru/a/cyberrevolution-tauinis-2011-01-17-113877164/192340.html.
3. Khaikin, S., Neironnye seti: Polnyi kurs (Neural Networks: Full Course), Moscow: Vil’yams, 2006, 2nd ed.
4. The principle of learning a multilayer neural network using the back propagation algorithm. http://robocraft. ru/blog/algorithm/560.html.
5. PyBrain’s documentation. http://pybrain.org/docs/.