Take a look at our guide to Twitter to make sure you're getting the most out of it.
These botnets do violate the ToS when using Twitter, but recent networks are getting more and more crafty when it comes to hiding their identity. You can usually spot bots by the frequency with which they are active around a certain subject. They tend to use popular hashtags to gain maximum exposure and sway general public opinion.
These particular bots have been around for some time, to the surprise of many – which just goes to show that the people that run them are becoming more practised and efficient.