https://www.reuters.com/article/us-twitter-s-p-500/twitter-shares-jump-5-percent-as-they-win-new-follower-the-sp-500-idUSKCN1J128Y

Consider it the ultimate "like" for a stock: Twitter Inc is joining the benchmark S&P 500 U.S. index, pushing the social media company's stock price up 5 percent on Tuesday as demand surged from equities investors.