Creation and conveyance of device-targeted messages

A system for message delivery, comprising:

• an addressing database;
• an analytics engine, wherein the analytics engine is configured to select a subset of recipients from a broadcast audience to whom a message should be broadcast, based on one or more rules determined by a user of the analytics engine;
• a message injection computing device, wherein the message injection computing device is configured to:
• receive, from the addressing database, a set of one or more addresses indicating the subset of recipients;
• inject, into a stream received from a stream origin computing device, a message comprising the set of one or more addresses;
• and
• transmit, to one or more remote display devices used by one or more members of the subset of recipients, and to one or more remote display devices used by one other than a member of the subset of recipients, the stream into which the message has been injected;
• and
• a receiving application, wherein the receiving application is configured to:
• store one or more addresses representing qualities of a device executing the receiving application or of a user of the device executing the receiving application;
• determine that a stream displayed by one of the remote display devices comprises the message;
• and
• responsive to determining that one or more of the stored addresses matches one or more of the set of addresses in the message, notify the user of the device executing the receiving application that the message is addressed to the user of the device.