To build an app that helps users share and get updates with only their close friends, there are several key features that should be considered. First, the app should have a user-friendly interface that allows users to easily add and manage their close friends list. This list should be easily editable, with the ability to add and remove friends as needed. Second, the app should have a privacy setting that allows users to control who can see their updates. This setting should be easily accessible and customizable, allowing users to choose which friends can see which updates. Third, the app should have a feature that allows users to easily share updates with their close friends. This could include the ability to post updates, share photos and videos, or send messages directly to their close friends. Fourth, the app should have a news feed that displays updates from the user's close friends. This feed should be easily accessible and customizable, allowing users to filter content by friend or type of update. Finally, the app should have a search feature that allows users to find and connect with new friends who are also using the app. This could include the ability to search by name, location, or interests. Overall, the app should prioritize user privacy and ease of use, while also providing a seamless and enjoyable experience for sharing updates with close friends.