Caching shared content in distributed systems

A computer program product for storing and referencing shared files, the computer program product comprising:

• one or more computer readable storage media;
• and
• program instructions stored on the one or more computer readable storage media, the program instructions comprising:
• program instructions to receive an indication from a first user, wherein the indication includes uploading a first file to transfer the first file from the first user to a second user;
• program instructions to determine a social graph;
• program instructions to determine whether the first file is stored in a repository associated with any user found in the social graph;
• responsive to determining the first file is stored in the repository of any of the users found in the social graph, program instructions to transmit a link to the first file found in the repository to the second user;
• responsive to determining the first file is not stored in the repository of any of the users found in the social graph, program instructions to upload the first file;
• and
• responsive to uploading the first file, program instructions to transmit the uploaded first file to the second user.

A computer system for storing and referencing shared files, the computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• and
• program instructions stored on the one or more computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising:
• program instructions to receive an indication from a first user, wherein the indication includes uploading a first file to transfer the first file from the first user to a second user;
• program instructions to determine a social graph;
• program instructions to determine whether the first file is stored in a repository associated with any user found in the social graph;
• responsive to determining the first file is stored in the repository of any of the users found in the social graph, program instructions to transmit a link to the first file found in the repository to the second user;
• responsive to determining the first file is not stored in the repository of any of the users found in the social graph, program instructions to upload the first file;
• and
• responsive to uploading the first file, program instructions to transmit the uploaded first file to the second user.