In the years I have been using the internet, I have noticed a growing phenomenon, which we should all be ignoring.
From their hovels underneath 'Ye Olde' English stone bridges, Trolls have been harassing Internet users for as long as there have been Internet users. Having studied these mythical creatures I have found that they feed on the negative energy generated from the comments they leave on Blogs, YouTube, and other such social interaction websites.
Do Not Feed The Trolls
Now, the best way to banish a Troll is to starve them of attention on your pages. If there is no negative energy to harvest, there will be no more Troll. Alternatively, blocking them works just as well (if not better).
If that doesn't work you could always try a circle of protection surrounding your computer, or is that for Witches... Might be worth it either way.
Since Nation of Nerds is a small blog, with barely any readers, we haven't had any trouble with Trolls, so I have no first hand experience, but all the time I see Trolls on YouTube, and various forums, and the people just feed them unknowingly.
This is what they want. They want to annoy you, and bait you into an argument you can't win. The trick is to burn them.
Burn them with Comments! Or don't, it may just make it worse.
But yeah, go with the blocking thing.. That'll work.