@splinterboost is an example for an auto-vote - I have just published this article, and already got a vote from it. It's not huge, but it occurs without review - nobody can read an article that long in 20 seconds :-D I don't know if they have algorhythms in place that help against abuse.

Another part are voting trails - one can follow a trail of a person they trust, and automatically vote on the articles that person is curating. I do that, too, because it also leads me to interesting articles. As example, I found the value post by following a downvote-trail which lead me to downvotes on comments from someone who likes to insult a lot, like really a lot. That rude person now tags me regularly in rant-posts about downvoting trails, which is interesting to read since it gives a different perspective.