如何从JSON文件中获取FB喜欢并自动更新页面

I was wondering how to fetch the "likes" of a fb-page through fb-graph and display them realtime on a webpage. I want to use socket.io, angular and node.js, but I am farely new to it. I got the information with this code, but I have to refresh the page, to get the new result. Can angular "watch" this URL?I was wondering how to fetch the "likes" of a f