Go to botsentinel.com, press "Analyze Account" (top right in green), and enter your Twitter handle.
Then post your score here.
Mine is 13%, rated "normal", meaning I'm not a bot.
Here's the scale:
Normal: 0% - 24%
Satisfactory: 25% - 49%
Disruptive: 50% - 74%
Problematic: 75% - 100%
The PFA Twitter account got a 0% score, meaning it's super normal and totally totally absolutely positively not a bot.