Generating catalog-item recommendations based on social graph data

One or more computer-readable non-transitory storage media embodying software that is operable when executed to:

• access one or more order parameters associated with a first user, the order parameters comprising one or more user-specified parameters;
• determine a user preference vector for the first user;
• access a plurality of references to catalog items offered by one or more vendors, wherein each reference is associated with one or more metadata items provided by the respective vendor;
• and
• provide, to a client system of the first user, a first reference of the plurality of references based on at least a comparison of the one or more order parameters, the user preference vector, and the one or more metadata items corresponding to the first reference.

A system comprising:

• one or more processors;
• and a non-transitory memory coupled to the processors comprising instructions executable by the processors, the processors operable when executing the instructions to:
• access one or more order parameters associated with a first user, the order parameters comprising one or more user-specified parameters;
• determine a user preference vector for the first user;
• access a plurality of references to catalog items offered by one or more vendors, wherein each reference is associated with one or more metadata items provided by the respective vendor;
• and
• provide, to a client system of the first user, a first reference of the plurality of references based on at least a comparison of the one or more order parameters, the user preference vector, and the one or more metadata items corresponding to the first reference.