Build a simple news reader and clustering application (in Ruby)

Build a simple application which takes a list of RSS sources, and presents them to the user in clusters based on keyword. The presentation will be similar to that of [login to view URL] (or Google News). For now, clusters could just be based on keyword density - or something equally simple. The application should also give more 'weight' to higher priority sources. Sources are prioritised 1-10. This product could have potential to develop in to something more complex (or more 'clever') - using more advanced technology to cluster and prioritise the sources, so it would be good if the developer is knowledgeable or interested in some of the following: News Clustering / Clustering Algorithms Natural Language Parsing Principle Component Analysis on word vectors AI Machine Learning (The system could also in the future form an automated system which feeds in to an editorial tool that makes it easy to spot and swap "incorrect" cluster assignments.) (This more advanced skill set is of course is not necessary to build the simple, initial application) The application should be built in a robust and future proof programming language, ideally Ruby.