Systems and methods for preserving device privacy

A system for client-side anonymized content selection, comprising:

• a computing device comprising a processor and a network interface in communication with a content server;
• wherein the network interface is configured to collect a plurality of identifications of content selection lists as the computing device navigates to different web pages;
• wherein the processor is configured to:
• notify a server of the plurality of identifications of the content selection lists that have been received by the browser;
• receive data indicating that a total number of different computing devices that have notified the server of the plurality of identifications of the content selection lists exceeds a threshold based on the computing device notifying the server of the plurality of identifications of the content selection lists that have been received by the browser;
• and
• select the plurality of identifications of the content selection lists, responsive to the data indicating the total number of different computing devices that have notified the server of the plurality of identifications of the content selection lists exceeds a threshold;
• and
• wherein the network interface is further configured to:
• transmit, to the content server, a request for an item of content, the request comprising the plurality of identifications of the content selection lists, and
• receive a first item of content selected by the content server based on the plurality of identifications of the content selection lists.