Examine their posts, likes and follows. If the account posts or likes content at an unnatural rate, it's probably a bot. Bots often interact within a network. If many similar accounts share the same content or amplify each other's messages, they might be bots.
Many accounts on here display this posting at an unnatural rate. Imgflip is full of unnatural posting rate bot accounts.
Account interaction on politic stream is also highly unnatural and artificial. Algorithmic clicks, tags and upvotes generated by user will activate specific conversation bots for simulated political discourse.
Politically programmed divisive bots primary function is to promote and market political identity belief systems that target and collectivize the dumb masses.