2016 was the biggest year by far for all sorts of bots, from Chatbots to bad bots, the past year was eventful to say the least. Social media bots were the most active in 2016, with social media bots being the most influential in major events such as the US elections and the rise of chatbots. 2016 was also the year of bad bots that altered history in 2016. The 2016 Dyn cyberattack was carried out by a malware known as Mirai, a malicious software that turned Internet of Things (IoT) into bots.”]
Source: https://securityaffairs.co/wordpress/55266/cyber-crime/2016-bots.html