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Limiting user base? I don't think it would hurt much. Half of internet users use Facebook.

Even assuming that figure is true, why cut your potential user base in half right off the bat? And for those who are FB users, what do they do when they want to exchange files with non-FB users? The service will be unusable in such cases even for FB users, and sendrail ends up losing more transactions.

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We also support hooking into your address book on your Mac, and are working on integrating your online email address book and ActiveDirectory into it. We're trying to cover every single contact mechanism out there so you don't have to worry about "finding the right tool" to send a file to someone -- we hope to make SendRail work for every single use case you encounter.

So how do you plan to make money? I can't see any pricing information, so I guess this is yet another case of users being the product.

Even if they have cut their initial user base in half, it doesn't mean they will not add alternatives in the future. FB integration solves a whole lot of issues around auth and sign up and generally makes your life easier when prototyping things imho.

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