Let's say I get why they'd block 4chan and 8chan, but blocking a blog is just over the top. Liveleak I also half-understand, but I also don't approve of it, for a while it was one of the best online video resources on the atrocities committed by ISIS in Syria and Iraq, just hiding our unwanted images under the rug won't help much.
Later edit: For example videos of the Tikrit massacre [1] are only available on Liveleak (I'm talking of the "mainstream" web), YouTube has nothing on it. It is my very strong opinion that we need these images to remain in the public psyche so that we'll try our best not to make the same mistakes again, and by censoring access to this kind of videos we're not helping with any of that.