1. Cormack GV (2006) Email spam filtering: a systematic review. Found Trends Inf Retr 1(4):335–455.
https://doi.org/10.1561/1500000006
2. Nexgate (2013) State of social media spam.
http://nexgate.com/wp-content/uploads/2013/09/Nexgate-2013-State-of-Social-Media-Spam-Research-Report.pdf
. Accessed 20 Apr 2019
3. Statista (2018) Twitter: number of monthly active users 2010–2018.
https://www.statista.com/statistics/282087/number-of-monthly-active-twitter-users/
. Accessed 20 Apr 2019
4. Prieto VM, Alvarez M, Cacheda F (2013) Detecting linkedin spammers and its spam nets. Int J Adv Comput Sci Appl (IJACSA) 4(9):189–199
5. Shen H, Ma F, Zhang X, Zong L, Liu X, Liang W (2017) Discovering social spammers from multiple views. Neurocomputing 225:49–57.
https://doi.org/10.1016/j.neucom.2016.11.013