Why does a question appear as modified by the Community user, but when you click on it there's nothing in the question or its answers done by him/it ?

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Aaargh! That Community user sticks its fingers everywhere! –  random Oct 3 '09 at 14:56
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up vote 5 down vote accepted

kd304 describes the most likely reason for "Community ♦" getting involved. Just for completeness, there is another purpose that you don't want to see on your posts... it is "Community ♦" who gets the blame if your post is obliterated as spam/offensive. Of course, you'd probably need > 10k rep to see the remains of such a post...

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Community user is an automated process to stirr up some old and unanswered question. Actually, the user page belonging on the Community user describes its purpose.

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ah, it bumped it? –  jmfsg Jul 18 '09 at 22:09
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You should be awarded a badge for meeting with the misterious stranger (F3 :) –  kd304 Jul 18 '09 at 22:11
    
As for that user page, for example: superuser.com/users/-1/community –  Arjan Oct 3 '09 at 15:27
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There's another reason for a question appearing to have been modified by the Community user - when a question is migrated, it's shown as edited by the Community user on the target site.

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When this is happening it is just the Community user making an "edit" (even though nothing is changed) to a random older post, to give it a bump (keeps the homepage fresh and helps questions that might have been missed get more attention).

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