(https://webapps.stackexchange.com/review/suggested-edits/111499 shows action by both.) [Edit: At first glance they both looked like special users. Not so.]
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3"user0" is just a normal, freeform username. The reason why the Community user reviewed the edit is explained at Why does the Community user approve and reject edits?– Sonic the Anonymous HedgehogCommented Mar 18, 2019 at 23:05
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5What about "user0" makes them look different than a normal user?– CatijaCommented Mar 18, 2019 at 23:59
2 Answers
Community♦ is a special user. Community is credited for reviews when they are:
Done by deleted users
Improved, in which case Community is shown as having approved the edit
Rejected and edited, in which case Community is shown as having rejected the edit
user0 is a normal user who just happens to have "0" in the username. user0 approved the edit before it was improved by a different user.
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@MatthewElvey users with a negative ID (e.g. -1 for Community) are special users. Normal users (e.g. 186471 for user0) have a positive ID. Commented Mar 19, 2019 at 13:39
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2@MatthewElvey Rejected edit suggestions don't show up in revision lists. You need to look at your edit suggestions. Or I can be nice and link you. ;) meta.stackexchange.com/review/suggested-edits/63581– CatijaCommented Mar 27, 2019 at 4:51
A key difference is that their real user numbers, respectively, are -1 for Community♦ and 186471 for user0 (on webapps, and thus not 0), as can be seen in the URL (classically displayed in a browser's status bar when mousing over the usernames) that clicking on the name opens.
Community♦ (/community is tacked on the end of the canonical URL) is a special user.
But user0 (/user0 is tacked on the end of the canonical URL) is a normal user who just happens to have "0" in the username. user0 approved the edit before it was improved by a different user.
I found no true user 0 - no user with ID 0 on any SE sites.
There is also no user with ID 1 on some SE sites, but
there IS a user with ID 1 on other SE sites.
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4All of the sites with "no user ID 1" had such users at their beginnings, but those users later deleted their accounts. Commented Mar 27, 2019 at 6:06