my email to seamlessweb.com:

We use seamlessweb for our weekly meetings, and we usually decide which one will pay the bill and keep a tab of who owes whom. We all have seamless web accounts, and we rotate.
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Is it possible to create a social feature on seamlessweb? We can separate the dishes to each user after purchase, and in return the system keeps tab of who owes whom.

• The recommendation engine get smarter
• Users will usually pay each other with another seamlessweb purchase

Take care and keep up with the good work.