The `<header>`-element does not define the [header of a sectioning element](http://www.w3.org/TR/html5/dom.html#heading-content-0). If I would run this thru the [html5 outliner](http://gsnedders.html5.org/outliner/) every tweet article would be a untitled section, and that's no good.

I would suggest to add a parent heading element prior to the `<ul>`something that describes the list `<hx>tweets from the students</hx>` and wrapp the tweet.user.name in a `<hx>`instead of a `<span>` then the outline will become something like this

![screen shot 2014-01-24 at 12 25 57](https://f.cloud.github.com/assets/74497/1994357/862abb9c-84ec-11e3-84ad-ca57dfcb8ad2.png)

I'm not sure of what level the heading element should have that's why I've used `<hx>`