How much is a Facebook user's personal information worth?
Users provide facebook a certain amount of information in return for access to the Facebook service and platform. (That includes apps like Voxer that can integrate with it.)
By denying Voxer access, Facebook is effectively making their service less valuable to its users. One day, they'll shut off access to a service enough Facebook users value that users will no longer value Facebook.
Twitter is going to learn this lesson the hard way too.
I dont think people use Facebook primarily for outside service integration. They use it to keep in touch, see family/friends photos, hang out, and gossip. When Facebook goes down (if it even goes down) it will be due to something that violated the user norms. Not their privacy, but their use pattern. I know the tech industry is used to startups lasting one to five years, but Facebook is back by all the right players, and will be here for a while.
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