Yelp Reviews Ticker is an easy to use widget that allows you to show your business yelp reviews.
Yes, super easy, all you need is a Yelp account, sign-up for a Yelp API key (http://www.yelp.com/developers/getting_started/api_access), and have your business listed on Yelp.
It's easy, login to your yelp account and go to this link http://www.yelp.com/developers/getting_started/api_access there you will "apply" for the Yelp API access and give you all the keys you need. The whole process takes about 5 minutes.
This widget works with the Yelp API and each site developer must have their own. If I were to provide you with mine I'd be breaking Yelp's API rules and terms.
Sorry that is not up to me. The API and YELP's terms only allow the latest 3 exerpts.
Again Yelp will allow only exerpts not the full review, but don't worry a link to the full review is posted right below it :)