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What’s the proper way to sanitize, normalize, and hash first-party data for Google, Facebook, Twitter, Reddit, etc.?
I’m mainly asking about email addresses.
First of all, do all those platforms use SHA256 to hash?
I understand that proper way to sanitize and address would be to remove any spaces and lowercase it.
But then, do we remove anything after +? Like [[email protected]](mailto:[email protected]) do we remove +extradata? Makes sense since all of those would go to the same mailbox. And people use this to differentiate where they sign up. But do all platforms do that when comparing hash?
Also, Google says they remove any dots in the name. That’s because Gmail disregards dots. So [[email protected]](mailto:[email protected]) and [[email protected]](mailto:[email protected]) and [[email protected]](mailto:[email protected]) would be the same. Again makes sense to do that for Google.
But do other platforms do that as well?
If I have email address [[email protected]](mailto:[email protected]), and I want to target it on Facebook. Does Facebook also remove all dots before hashing and matching? Or should we only do this when uploading to Google?
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Yes they all use SHA256 but each have their own rules on formatting which are in their dev guides. The main consistency is that you should always hash before you send to the platforms vs relying on them doing it for you, especially on the server side solutions.
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