Evidence? Perhaps too early for that, but the article notes the pollster publishing the results of a survey after he left Facebook and started his own company:

Evidence? Perhaps too early for that, but the article notes the pollster publishing the results of a survey after he left Facebook and started his own company: "Among tech companies, 32 percent of Americans said Facebook is harmful. A separate survey, which placed Facebook among other large brands including Walmart, McDonald’s, and Marlboro, found that 27 percent said it is harmful." There was an old article about which companies people could abandon first, among companies like Facebook, Google, Apple and Amazon. I believe Facebook was pretty high on that list. If you look at what happened to a company like AOL (just typing that seemed weird) or even Myspace, it's quite easy to imagine Facebook fading hard, mostly because people WANT it to fade, or they lose interest. On my own side, I only keep it around to share photos of my kid with my close friends and family. Beyond that, among the FB friends I have from years of working in tech, very few of them ever post anything at all. There's a silent percentage of the demographic who basically use FB as an RSS reader. How valuable will that be over time?