Designing a brokerage/investing app for Facebook would require a deep understanding of both the Facebook user base and the investing landscape. Here are some key considerations to keep in mind: 1. User Experience - The app should be easy to navigate and use, with a clear onboarding process for new users. It should also be aesthetically pleasing and have a consistent visual style with other Facebook products. 2. Investment Options - The app should offer a range of investment options, including stocks, bonds, ETFs, and possibly cryptocurrency. These options should be easy to browse and search for, and users should be able to set up automatic investments if they choose. 3. Social Features - Given that this is a Facebook app, it makes sense to incorporate social features that allow users to share their investments and investment strategies with their friends. This could include a news feed that shows what stocks their friends are investing in, or the ability to create and join investment groups. 4. Security - It is crucial that the app be both secure and trustworthy, given that it will be handling users' investments. This means implementing robust security features like two-factor authentication and encryption, as well as complying with all relevant regulations and laws. 5. Customer Support - Finally, it is important to offer excellent customer support to users, with a range of options for getting help if needed. This could include live chat, email support, or a dedicated phone line. By keeping these considerations in mind and working closely with the Facebook team, it should be possible to design a brokerage/investing app that meets the needs of both Facebook users and investors alike.