srm
I saw the commentary about not keeping too much personal information. But without any e-mail addresses, how do you send notifications of activity? Without that feature, I don't imagine any future where I would use this site. It pretty much limits the utility to only those who are power users who will be checking it every single day. That's not how I use SE, and it definitely is not how I use SE at work... when I need a Stack Overflow question answered, I post it, and then I go back to work. I do not want to have to click back regularly to poll for results. 

So, question: What are the plans for sending notifications if you're not allowing us to submit e-mail addresses? 
Top Answer
Jack Douglas
> I saw the commentary about not keeping too much personal information

It's not that we are avoiding PII, but that we don't want for *force* you to hand over anything more than the bare minimum.

> So, question: What are the plans for sending notifications if you're not allowing us to submit e-mail addresses?

Email notifications and account recovery are two reasons for having the option to add a verified email addresses to your profile.

I've moved this on to [to a GitHub issue](https://github.com/topanswers/topanswers/issues/25) so work can progress, and will update the post here when it is complete.
Answer #2
PinoBatch
If the user has chosen to enable JavaScript, the site could offer use of the [Notifications API](https://developer.mozilla.org/en-US/docs/Web/API/Notifications_API/Using_the_Notifications_API).

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