Social media bots
A bot, also known as a zombie, automatically performs a task or set of tasks usually under the command and control of a remote administrator, or what is known as a bot master.
Social media bots have been used by spammers/scammers on social media sites as a method of pushing their spam/scam to numerous accounts. They do so by increasing the number of followers on their bot accounts, increasing likes/views, and also as a method to mass distribute malicious content.