Dynamically generating and serving content across different platforms

A system for dynamically serving content for presentation across different channels, the system comprising:

• a server system configured to:
• provide to a client device, a page template for presentation in a graphical user interface (GUI) display, wherein the page template is used for generating a page in an online platform, wherein the page template comprises (i) predefined slots and (ii) parameters for presenting content in the predefined slots;
• receive a request from the client device for a subset of a plurality of content elements, wherein the request designates a device interface type indicating a desired channel for presenting content in the page in the online platform using the page template;
• dynamically generate the subset of content elements, wherein the dynamically generating comprises:
• identifying each content element in the subset of content elements having a content attribute that satisfies one or more subset creation criteria,
• for each content element in the subset of content elements, dynamically adjusting presentation of a singular instance of the content element according to presentation requirements of the designated device interface type,
• selecting a portion of content elements in the subset of content elements that satisfy one or more presentation parameters, and
• removing another portion of content elements from the subset of content elements that do not satisfy the one or more presentation parameters;
• and
• serve the subset of content elements to the client device, wherein the served subset comprises the singular instances of the content elements that were dynamically adjusted according to the presentation requirements of the designated device interface type, wherein the singular instances of the content elements are selectable, by a user at the client device, for presentation in the slot in the page template used for generating the page in the online platform.