It's why, I imagine, Foursquare still exists after Facebook places, why Facebook bought Instagram, and honestly why Facebook even exists in a world of Google's and Microsofts.
But what if at the genesis of every single new product, startups began feeding real time access to their most important stats to those 800lb gorillas? What would happen? Well for a while the big guys might ignore the data and scoff at caring about some insignificant startup numbers.
But then one day one of those startups would probably become really successful. Billion dollar acquisition successful. And all of a sudden the minds that be at the 800lb gorilla would say to themselves - "Wait! Why are we waiting for companies to be big enough that we need to pay $1B dollars! Why don't we just start buying or copying products as soon as they have really high engagement and growth rates before they come close to owning the market?"
And this seems to be exactly what happened with Facebook and Poke. Facebook has acknowledged [http://techcrunch.com/2012/12/21/mark-zuckerberg-voice-of-poke/] they tried to buy Poke a little while back, and when they were rejected decided to build it. And it seems to be working - as of right now Facebook Poke is now holding the #2 spot in the app store, while snap chat is #5.
This is in no way saying Poke has won, but if i were the SnapChat team I would be concerned. In fact, I think anyone that uses the Facebook API should be. I am. The Facebook API is an amazingly useful and powerful tool, but this is an issue that needs to be discussed, and the ramifications need to be understood. Because right now Facebook clearly seems to understand them, even if we don't.