Currently, users are automatically merged if SE detects certain situations that indicate that the users belong to the same real person. Some aspects of this have been mentioned in meta posts, but in general this isn't a well documented system, and some aspects are likely not publicly known at all.

Using several accounts is not officially supported, but so far it is generally tolerated as long as the accounts never interact at all. Probably the most common legitimate reason to use several accounts is privacy, to avoid linking certain posts to an account that uses a real name or is otherwise not anonymous.

If someone asked me how to ask a question anonymously when they already have an SE account, my answer would probably make me look rather paranoid. When I do this, I use the TOR browser to create a browser sessions that has no chance of being connected to my real account in any way, and I abandon the account after I'm done and don't reuse it. I don't know how the automatic account merges work, so this is the only way I know that should avoid them in any case. This is obviously not a very reasonable answer to an average person asking how to ask an anonymous question on SE, but it's the only safe one right now.

I know this isn't an officially supported way to use SE, but I'm not asking to officially support it. I'm only asking to change the automatic merges so that they don't happen without the user confirming them, so that they'll never break the privacy of a person using SE accounts in this way.

The SE network has expanded to a lot of different topics, and unless you're a completely anonymous user, there are quite a few sites where it can easily be problematic to participate. Asking a question on Workplace under your real name would often be a dangerous thing to do, linking your religious or political views to your real name is also something many people would hesitate to do for understandable reasons. But all these things are encouraged by the way the SE account system currently works.

Changing the automatic merges would make it significantly safer to use a second anonymous account, and I do think this is a use case that should be tolerated, even if it isn't officially supported.

PS: This has nothing to do with vote fraud, or any other use of socks that is against the SE rules. Those are never merged anyway, they're deleted outright.

  • I was under the impression that automatic merges only happened if the same email was used for both accounts
    – Cai
    Feb 24, 2018 at 21:57
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    @Cai I don't know, it's not really documented. It's certainly part of the system, but maybe not the only one. And it does use indirect, verified emails, so if your official facebook email address is the same as the one in a different OpenID provider, it'll merge as far as I understand. And this is not something I'd expect regular users to anticipate Feb 24, 2018 at 22:04
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    I use sock account for years, the "trick" is just using different browser sessions, or at most Private/Guest modes. No TOR, no panic. It works. Proven. So since the issue isn't as big as you claim, I don't think SE should change anything. Feb 25, 2018 at 23:28
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    @ShadowWizard you also need to use throwaway email addresses or unregistered accounts (which is not possible for all sites) to avoid the merge. You have 90k+ meta rep, as have I, we're very, very far from being average SE users. New users would probably not expect their accounts to be merged if they simply used their Google account for one user, and their Facebook account for another user, but exactly that can happen. And I suspect most people wouldn't even know what you're talking about when you say "different browser sessions". Feb 26, 2018 at 6:43
  • This might be true, but still... many people do have several emails (not throwaway, permanent emails being used), and many do know about browser session/profiles. Feb 26, 2018 at 6:50
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    Adding return link from related post on Stack Overflow Meta: meta.stackoverflow.com/questions/363785/…
    – IMSoP
    Feb 26, 2018 at 18:42
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    I was under the distinct impression that using multiple accounts is officially supported. See, for example, meta.stackexchange.com/a/35607/189281 and the last paragraph of meta.stackexchange.com/a/57685/189281. (This makes the issue of automatic merges even more troubling, of course.)
    – N. Virgo
    Mar 1, 2018 at 6:00
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    A few years ago, I contacted SE about a problem preventing me from saving changes to profile info. They discovered it was due to an old abandoned account (I guess with the same email somehow) so they merged both accounts without asking me. This caused some side effects that still annoy me to this day. ¯\_(ツ)_/¯
    – 41686d6564
    Dec 18, 2022 at 3:28
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