Replit allows developers to create social coding activities, including multiplayer features, chatrooms, and real-time code collaboration. To avoid abuse, safety by design is key, involving planning ahead to incorporate rate limiting, filtering, and moderation features. The best approach varies depending on the app's category and target audience, with examples from popular apps like Twitter, TikTok, and Instagram providing guidance. Utilizing existing libraries and open-source code can also simplify safety features. Establishing clear behavior guidelines and enforcing them is crucial, using a simple list of rules that users must agree to before accessing social features. By prioritizing user safety, developers can create thriving communities on Replit.