If not ad revenue on mobiles, or loss of cool, I think what will kill Facebook is when the EU or the FTC "realizes" that social media access is a critical part

If not ad revenue on mobiles, or loss of cool, I think what will kill Facebook is when the EU or the FTC "realizes" that social media access is a critical part of the societal infrastructure and should be regulated by government and available to all. That is, when the EU or FTC standardizes APIs that they require of Facebook, Google+, LinkedIn, Twitter so that tweets, and posts can stream easily and automatically from one network to another. And I don't know, but I bet that could happen with the next couple of years.