Im a Gobot..don't know if that satisfies you though.

Having to captcha every post would suck.

But having to do it every nth post wouldn't be so bad if it kept out the bots and screwed with script users.

Identifying the sock puppets/troll networks is not easy. Can it be done? Yes. How? Mining.
Just to keep it simple.What the site operators would have to do is make the star and flag system identifiable.
So if one wanted to know who flagged. Click the flag and a list of names appears. Same for the star system.
This is how you can mine out the sock puppets/troll and their networks.

A method like this has been implemented at liveleak. Though I doubt that site is using a sock puppets/troll miner. I have seen the source for a sock puppet/troll miner. It was made in china.

Can anyone show that there are algorithims present that makes someone a bot.

What determines if someone is a bot? What makes someone suspicious of being a bot?

So far all the bots I see running on the internet presently are poorly programmed. Usually are just spam bots. I have never seen any evidence for an advanced communication propaganda promoting bot.