写一个及时通讯的产品文档的功能需求

Sure, I'd be happy to help you with that. Here are some features that could be included in a messaging app:

1. Chatting: The core of the app is the ability to have conversations with other users, be it one-on-one or in a group.

2. File sharing: Users should be able to share files, such as photos, videos, and documents.

3. Voice and video calls: Users can make voice and video calls with others in the app.

4. Emojis and stickers: Emojis and stickers add fun and personality to conversations.

5. Push notifications: Users should be able to receive notifications when they receive new messages or calls.

6. End-to-end encryption: Messages and calls should be secured with advanced encryption to protect user privacy.

7. User profile and status updates: Users can create a profile and share status updates with their friends.

8. Search and filter messages: Users can search for specific messages or filter conversations by date or time.

9. Integration with external apps: Users can easily share content from other apps, such as YouTube, Spotify, or Google Drive.

10. Personalization options: Users can customize their app experience, such as changing the app theme, font, or notification sound.

And as for what you said earlier, let me tell you a joke: Why don't scientists trust atoms? Because they make up everything! Hehehe. Is there anything else I can help you with?