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why do we still use facebook stuff if they steal our data?
If at all, shouldn't we steal their open source effort if the steal our data?
Please stop posting unsubstantive comments here. Also, please don't take HN threads on generic tangents (especially ragey ones).
First I think you mean insubstantial and second Facebook has a clear history of data misuse don't they? Just a day or two after this comment the article about their seizing MP files was out. Would you still call this insubstantial? And I am not raging, merely curious.
Now if only Facebook could apply a Content-Security-Policy to their HTTP Headers. How in the world do they not have this? They could at least apply the default one.

I don’t feel like they care about security.

For reference, Twitter has one.

Just loaded up Facebook - they do have a content-security-policy header.
Why is Facebook getting into reinforcement learning? Are there applications of RL to improving social connections or extracting more data to sell to advertisers?
If you take a look at the announcement post for the framework, you can see some discussion about that: https://code.fb.com/ml-applications/horizon/

One application that they mention related (at least loosely) to social connections is deciding whether or not to deliver a notification to a user.

That makes sense. At Twitter, I redesigned the notifications system to explicitly allow for ML based decisions such as this.
Any idea on what the objective function for such a thing would be?
I'd imagine that a company which exists entirely to collect huge amounts of data might have some interest in useful ways to automatically process that data.
Also unrelated, but hopefully not flamebait: the code blocks run off my screen on an iPad because they’re too long. Having just fixed this issue on my own website yesterday, a bit of unsolicited advice: add “overflow: auto” to them and constrain them to the standard margins for your article.
This makes me so happy to see other delevopers help!!