Now you can send your messages to specified groups of users with module Messages! Using the Users module you can assign tags on a user thus creating a group of users. And in the module Messages use existing tags to define groups of the users of your app, which will receive your message. The API documentation has been updated on the http://wiki.quickblox.com/Messages.
You can also use this functionality via Admin panel. You have to choose the advanced mode for sending a message via module Messages. In the settings “Subscribers” you can choose users that contain any of specified tags or contain all of specified tags and exclude users that have specified tags and send a message only to the users that have been defined.
Enjoy new features!