App to host and rate FAQ information

Hi All,

I work as a Trainer and i am trying to find an app that allows me to post FAQs easily and as officers use the information they can click a button to say they have used it. The more clicks it gets the higher up the list it will rise. I also need them to be able to make multiple clicks if they access the information more that once over the time it is posted. Does such an app exist?