  While most online social media accounts are controlled by humans, these
platforms also host automated agents called social bots or sybil accounts.
Recent literature reported on cases of social bots imitating humans to
manipulate discussions, alter the popularity of users, pollute content and
spread misinformation, and even perform terrorist propaganda and recruitment
actions. Here we present BotOrNot, a publicly-available service that leverages
more than one thousand features to evaluate the extent to which a Twitter
account exhibits similarity to the known characteristics of social bots. Since
its release in May 2014, BotOrNot has served over one million requests via our
website and APIs.
