Key

.js

import { Component } from "react";
class Tweet extends Component {
    render() {
        return (
            <div>
                {this.props.tweet.map(tweet =>
                   <div key={news.tweet_id}>
                        {tweet.tweet_topic}
                        <br />
                        {tweet.tweet_detail}
                   </div>
              )}
            </div>
        )
   }
}
export default Tweet;