Before going further i want to understand the purpose of this features and its goals.
What is this feature ?
Who is this for ?
Why do they use it ?
Now Assuming that -
The purpose of the feature for FB is to increase engagement (GOAL), it wants to facilitate lending between people, basically to promote the benefits of shared economy
This feature helps people to share their owned goods and services with other people, may be to make some cash or to help others with
This feature is for two type of people
Lender - people who own certain goods that is not been used by them currently, they want to lend it to others to make help them or make some cash
Borrower - People who want to borrow goods from lender, may be in exchange for some money
People will use this feature for
Want to help other people, might also need to make some cash out of it
Have unused owned goods, that is not used by them, that could be used by someone else
Might want to get rid of some of the belonging as they consume space at their place
In need of some item, which they want to use but dont want to purchase it
Might be willing to pay some money for its use
Base on above understanding, lets check the challenges faced by the both lenders and borrowers
What goods can be lend to others ?
Finding out whom to lend ?
At what price and for how much time to lend ?
How to come in consonance with the borrower for the price, time, and mode of delivery?
How to actually exhange the good ?
How to make sure that lender would return will return the good ?”
What if the leder wont return the goods ?
What if Lender returned the goods late ?
How to facilitate the return of the good ?
To figure out what goods are available for borrowing ?
Who is the owner of the good ?
At what price and for how much duration is the good available ?
What are the terms and condition of borrowing ?\
How actual exchange of good will happen ?
How to return the good upon use ?
Based on the needs of both borrowers and lenders, the most important problem to solve seems to be who can lend whom ?
The reason for choosing above is simple, that all the other steps, what price to be paid, how to exchange goods, how to agree upon term and conditions, how to return goods etc depends on who is lending to whom, because these aspects would matter differently based on who is lending to whom i.e if a person is lending to his friend or if a person is lending to others (not known person), for eg
Another reason for choosing friends to lend is that we want to make sure that people keep using this lending feature, people have reservation when lending to others, they are more likely to lend to their friends hence other bottlenecks like price determination, returns etc can be sorted much easily among friends as compared to when people are lending to others
Once we have decided, that users will have the option to lend to others, next thing is what could be lend ? As they are lending to their friends only, they can lend any of their owned assets eg physical goods like car, books, phones and digital services like netflix, or prime subscription.
As we have decided that user can lend any good to their friends, now lets brainstorm how can we do that
Based on above two soltuions