AJAX Feed of Latest Posts (for on-wall monitor)

I'd like to install a monitor on the office wall that shows incoming activity....starting w/ latest posts. 

What are some ways of achieving this?  Risks? Tips? Gotchas? 

I can handle the interface mods - mainly wondering about what to call and how to call it.  I was really deep into AJAX development about 10 years ago, so my current knowledge is probably dangerous. 

Current Plan (critique/add)

1. Set up Read-Only user
2. Set up Raspberry Pi to load whatever web page we build in whatever steps are to follow.
3. ...