Shift blame? Facebook created an API that would allow people to create genuinely useful apps provided that users allowed them to access their data. I can think of a thousand interesting use cases for the data Facebook provided through their api.

One bad actor screwed everyone.

I'm surprised at how few people on hackernews have ever built or worked with apis.

Facebook essentially built an open platform and now they are being punished for it because people are too stupid to understand what they are signing up for.