PURL allows you to define rules based on URL patterns, depending on paths, domain, subdomain and more. Spaces can be set to be activated when one of these rules is triggered. Spaces then allows you to override the appearance and functionality of the site within a particular space, by switching on and off features, and overriding variables

RT @JohnAlbin: My god. How did I miss this classic #drupal patch? SO. GOOD. @eaton +1

#Drupal‬ community, please help us select the best ‪#WYSIWYG‬ editor for ‪#Spark‬, and hopefully incubate it for D8: http://drupal.org/node/1580210#comment-6039868 Thanks!