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"I'd wager that many startups don't implement Facebook signin because of the engineering overhead that could be spent on sexy new features."

How much time is really spent integrating FB Connect?

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The fact that it requires learning a new API makes it a non-trivial feature, engineering-wise IMO.

I wouldn't have deemed it trivial, but the part I quoted made it sound like the associated workload was pretty heavy.

I haven't looked into the API or what it takes to integrate it, but I assumed (bad habit, I know) it wouldn't necessarily be rocket science. Aren't most API's relatively simple to use compared to the actually building of an app?

Plus, if it causes a huge increase in users and tire-kickers, it seems an app would get more chances to show off their sexy features anyway.

After looking at the docs it doesn't appear to be incredibly hard.

I think the most non-trivial thing would be integrating with the current site sign-on. Issues such as an existing users that decide to sign on with facebook (which is linked to a different e-mail address) could become a problem on the backend.

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