These slides are part of tech talk for the XII Betabeers Cádiz. It is just an intro to a demo app that features the use of Iteratees along with the Reactive Mongo Driver with capped collections and the Twitter Streaming API over Comet. Part of the talk was an intro to Heroku and how easy it is to deploy Play2 apps on Heroku and how Heroku makes it easy to scale horizontally Play based apps.