Wall Street is often obsessed with the latest high-growth stocks, but many of the market's sexiest stocks might not be around after a few decades. Today, three of our Motley Fool contributors will take a closer look at a trio of stocks that could easily last for 50 years or more -- Facebook (NASDAQ: FB), American Tower (NYSE: AMT), and Moody's (NYSE: MCO).Image source: Getty Images.Leo Sun (Facebook): Facebook's monthly active users (MAUs) rose from 100 million in the third quarter of 2008 to 2.23 billion in the second quarter of 2018, making it the world's biggest social network.