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. Social media bots are being used by spammers/scammers on social media sites as a method of pushing their spam/scam to numerous accounts. Twitter bots have been used for spam, for luring of clicks on promotional links, and for automatically retweeting in response key word/phrase tweets. Twitterbots have been suspected of being used to promote presidential campaigns in Mexico and Russia.”]
Source: https://blog.malwarebytes.com/threats/social-media-bots/