As far as I know the only platform that really supports that is Tumblr, which lets you create as many secondary blogs as you wish with just one e-mail address (

As far as I know the only platform that really supports that is Tumblr, which lets you create as many secondary blogs as you wish with just one e-mail address (and Youtube if you count it). For every other platform users will be impeded by the fact they have to create a second e-mail to create a second account because they don't know how to use e-mail folders. You can't even switch accounts on Reddit which means you need to use a browser that supports switching cookie jars somehow. In summary, I'm willing to bet the average user just posts everything on a single account. And even if they used separate accounts, that doesn't change the fact that the blocks/follows of their identities isn't private.