Social media started long before Facebook in the early 2000s, but Mark Zuckerberg’s launch really defined the space. More than anything, it gave it stability. Before that, sites like MySpace and Xanga had risen and fallen. Users had turned to forums, chat rooms and other forms of communication, but they were never mainstream. With Facebook, you suddenly had a platform that everyone could use -- at least, after they expanded beyond college and opened it up to the public -- and that appeared stable enough to last. Now, in 2019, even with concerns that young people do not use it as much as they once did, that stability is undeniable.