A lot of the time, it takes a few iterations before a product becomes truly useful. Once a product has become useful and has fully integrated itself into its c

A lot of the time, it takes a few iterations before a product becomes truly useful. Once a product has become useful and has fully integrated itself into its customers lives - it's very difficult to replace it. For many, Facebook solves a unique problem - it provides them with tools to help them manage their various relationships. It's ubiquity is a key part of its solution, and any other platform that wanted to supplant Facebook is obviously going to find it difficult. Having said that, I think it's perfectly reasonable to think about what will replace Facebook. As a company becomes larger - it will usually become less nimble. Unforeseen changes in the market's landscape, provide opportunities for new entrants - where the larger Goliath companies aren't as able (or willing) to adapt. Facebook will be killed (replaced / supplanted) .. but without the benefit of hindsight, it's very difficult to know which company will succeed.