More from the article...

...Review Their Posts

While bots can mimic humans, they are always subject to their programing and looking over their posts may show you patterns in that programming.

- - - Tunnel Vision: Bots are created for a purpose. This could make them seemingly obsessed with a particular topic by repeating a link too much.

- - - Temporal Behavior: Too many posts in too short of a time, posts that are too consistent. If an account posts at unlikely times or even too regularly, it can be an indicator that it's fake.

- - - Look at comments: Review comments to see if there are scam links or suspicious replies to note.
...