If your wondering why your example on that page isnt working, bring up your Javascript console (Command + J) and you'll see the error. You need to initialize the myApp module.
Something like
angular.module('myApp',[]);
The error can be found here: http://tinyurl.com/mbvhc5a
And to answer your question, yes you can use angular for your blog, but the question is more likely to be is it the right choice? For most blogs, the answer would be no, unless your planning a high amount of user interaction with the UI.