Distributed content serving

A system comprising:

• an end device that comprises a processor and a memory;
• a server;
• wherein said processor being adapted to:
• obtain Personally Identifiable Information (PII) data of a user of the end device, wherein the PII data is based on information obtained by monitoring the user using the end device, wherein the PII data represents activities of the user, wherein a privacy of the user is violated if the PII data is divulged to any device external to the end device;
• based on the PII data, generate, at the end device, a user profile, wherein the user profile indicates that the user of the end device matches at least one population segment, wherein the at least one population segment comprises a defined frequency of a user activity indicated by the PII data;
• communicate with said server to receive a set of one or more campaigns retained at the server;
• select a campaign from the one or more campaigns, wherein the campaign comprises one or more executable rules for displaying at least one content item, wherein said selecting is based on the campaign being designated for the at least one population segment, wherein said selecting is performed by the end device without the end device providing any of the PII data to the server, thereby preserving the privacy of the user;
• monitor, at the end device, real time user activities of the user;
• and
• upon identifying, based on the real time user activities, that a rule of the one or more executable rules for displaying a content item is complied with, display the content item in the end device.

A server comprising:

• a database of one or more campaigns, wherein each campaign of the one or more campaigns comprises one or more executable rules for displaying at least one content item, wherein the each campaign is designated for a population segment, the population segment is defined based on a defined frequency of a user activity;
• a network connection configured to enable communication of said server with a plurality of end devices;
• wherein said server is configured to distribute the one or more campaigns or portion thereof to each of the plurality of end devices,
• wherein each end device of the plurality of end devices is configured to collect Personally Identifiable Information (PII) data of a respective user of the each end device, wherein the PII data is based on information obtained by monitoring real time user activities of the user using the end device, wherein a privacy of the user is violated if the PII data is divulged to any device external to the end device;
• wherein said server is configured to receive reports from the plurality of end devices, wherein the reports indicate which content items were presented in each of the plurality of end devices and statistical information regarding the interactions, wherein the reports do not violate a privacy of users of the plurality of end devices.