[Cassandra Wiki] Update of "DataModel" by jeremyhanna

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The "DataModel" page has been changed by jeremyhanna:
https://wiki.apache.org/cassandra/DataModel?action=diff&rev1=42&rev2=43

Comment:
Added a link to Sebastian's data modeler tool and links to twitter accounts.

  
  This allows pervasive denormalization to "pre-build" resultsets at update time, rather than doing expensive joins across the cluster.
  
- A blog post by committer Tyler Hobbs that gives [[http://www.datastax.com/dev/blog/basic-rules-of-cassandra-data-modeling|Basic Rules of Cassandra Data Modeling]].
+ A blog post by committer [[https://twitter.com/tylhobbs|Tyler Hobbs]] that gives [[http://www.datastax.com/dev/blog/basic-rules-of-cassandra-data-modeling|Basic Rules of Cassandra Data Modeling]].
  
  !DataStax has a free self-paced online course [[https://academy.datastax.com/courses/ds220-data-modeling?dxt=blogposting|DS220: Data Modeling with Apache Cassandra]].
  
- For more detail, see Patrick !McFadin's data modeling series:
+ A blog post by [[https://twitter.com/syllogistic|Sebastian Estevez]] describing a web based tool he created to help visualize data models (pre-3.0) as well as gives a tailored cassandra-stress configuration file to test the model. [[http://www.datastax.com/dev/blog/data-modeler|Using the Cassandra Data Modeler to Stress and Size Cassandra Instances]]
+ 
+ [[https://twitter.com/patrickmcfadin|Patrick McFadin's]] data modeling series:
  
   1. The Data Model is Dead; Long live the Data Model: [[http://www.youtube.com/watch?v=px6U2n74q3g|Video]], [[http://www.slideshare.net/patrickmcfadin/the-data-model-is-dead-long-live-the-data-model|Slides]]
   1. Become a Super Modeler: [[http://www.youtube.com/watch?v=qphhxujn5Es|Video]], [[http://www.slideshare.net/patrickmcfadin/become-a-super-modeler|Slides]]