1. Twitter. Available at:
https://twitter.com/
2. Facebook. Available at:
https://www.facebook.com/
3. LinkedIn. Available at:
https://in.linkedin.com/
4. Statista report. Available at:
https://www.statista.com/statistics/282087/number-of-monthly-active-twitter-users
5. A.A. Amleshwaram, N. Reddy, S. Yadav, G. Gu, C. Yang, Cats: characterizing automation of twitter spammers, in Proceedings of the 5th International Conference on Communication Systems and Networks (2014), vol. 1, pp. 86–95 (Springer, Berlin, 2014)