Here are some basic steps you can follow to create a social media app:
1. Define your target audience and main goal of the app.
2. Investigate successful and competitive social products to identify unique selling points.
3. Describe features for social media app development.
4. Design the mobile app, create a wireframe, and use best practices for UI/UX design.
5. Complete app development and quality assurance, and address bugs through QA testing.
There are also tools available to create a social media app without coding knowledge.