"Facebook later told TechCrunch that it won’t give access to data to any company that doesn’t share much back". Is that documented anywhere? I never heard about usage restrictions based on sharing. This is going to get a of lot startups worried...
I find it really silly that a startup wouldn't be worried to begin with. Think about this for a second: building a network effect is extremely hard. Extremely hard = lots of time = lots of money. All of the sudden, a company (like Facebook) is giving away access to their massive identity database away FOR FREE. Let me rephrase, they are giving away something they've spent massive amounts of money to create for free.
If someone can't compute that, then I feel no sympathy for your startup that goes tits up.