It might not have succeeded if Zuckerberg had been accountable to others. (Who’d have believed it?)
Today it looks socially harmful, and, looking back, it didn’t escape the MySpace cycle (what was once was hip is now passé) it just buys competitors one cycle at a time. It is still around but it is running on a treadmill and if it falters two cycles in a row kids will be asking their parents ‘what was Facebook?’