Digital image tagging for split transaction processing

A method comprising:

• receiving a transaction history for a transaction by a first user with a merchant;
• receiving online posted data from an online sharing resource, wherein the online posted data comprises at least user information identifying a second user;
• determining that the second user shared the transaction with the first user using at least the online posted data;
• determining a portion of the transaction corresponding to the second user, wherein the second user is responsible for the portion of the transaction;
• and
• processing a reimbursement transaction to the first user from the second user.

A computing device system comprising:

• a non-transitory memory;
• and
• one or more hardware processors coupled to the non-transitory memory and configured to read instructions from the non-transitory memory to cause the system to perform operations comprising:
• accessing, by the computing device system for a first user, an online social networking resource associated with the first user;
• communicating a post to the online social networking resource to share on an online social networking platform corresponding to the online social networking resource, wherein the post identifies a second user associated with the first user;
• processing, with a service provider, a transaction for the first user and the second user with a merchant using a payment instrument of the first user, wherein the first user and the second user share the transaction;
• and
• receiving, from the service provider, an indication that the second user processed a reimbursement transaction for a portion of the transaction required by the second user.