So I'm in the process of a pretty massive WordPress/forum install/social media footprint project (manually setting up through a web host, this is relevant), and just now I got around to creating the social accounts and linking API keys and the such. Here's how I set up my email / external accounts such as Disqus, twitter, FB and so on:
Site admin email setup through my host, only used for new registration emails, password recovery, etc
Generic freshly created outlook.com email, no contacts. This is tied to pretty much everything. I have the Facebook page, twitter account and Disqus moderation all tied to it. I used my own name when registering all of these, and will swap out both the email and my name once the project is complete. You pretty much have to use your own credentials and phone number to set up developer stuff, just makes it a lot easier in the short term.
Anyway, on to the creepiness. At no point was my personal email ever tied to anything. It's also worth mentioning that I created a dummy account for the Facebook page. Yet somehow, after setting up social media auto posting from the main site and testing it out, Twitter managed to suggest a massive amount of people that I know in real life. Even a random person I had played WoW with (who's also on my FB) years ago.
How?! Short of some cookie madness, I don't get it. Nothing whatsoever is tied to any person email, facebook, twitter, etc. Everything was proxied through fresh accounts.