When you have a hard time finding things to vote on, (yeah it really does happen), you could try taking a look at the Engagement League post that Asher puts out every Sunday. If you are not familiar with it, it is a voluntary list/tracker that people sign-up for and then Asher tracks how engaging the person was over the week. So there are bound to be one or two people on that list that may have content you enjoy. 

Keep in mind when looking at the list it is only the top 100 that get mentioned, the list is a lot lot longer than what is shown, that top 100 I think this last week represented 15% of the people on the list, or there abouts.

Most times if a person is going to be active commenting, they are also active posting. Not always, but a lot of times.