Botometer (formerly BotOrNot) checks the activity of a Twitter account and gives it a score based on how likely the account is to be a bot.

Higher scores are more bot-like. Increasing evidence suggests that a growing amount of social media content is generated by autonomous entities known as social bots. Many social bots perform useful functions, but there is a growing record of malicious applications of social bots.

We believe it is important to provide public datasets and tools that help identification of social bots, since deception and detection technologies are in an arms race. Bot repository is a centralized place to share annotated datasets of Twitter social bots. We also provide a list of available tools on bot detection.