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I opened the active questions page on meta.stackoverflow.com and I saw this:

enter image description here

"modified 39 mins ago"

Clicking on the last activity link it goes me to the question page. I don't see anything modified by Community♦ on this page.

I saw that this thing happens frequently.

Is this a problem/bug, or I didn't understand something? Which is the answer?

marked as duplicate by Bart, animuson, ʞunɥdɐpɐɥd, Daniel Fischer, Hugo Dozois Jun 11 '13 at 20:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 1 down vote accepted

This is probably just the Community user bumping an old question. Happens every hour or so.

enter image description here

From the Who is the Community user? post.
Part of is duty is to bump unanswered question so they get attention. Doesn't mean it (he ?) changed something in the post.

Hi, I'm not really a person.

I'm a background process that helps keep [Meta] [Stack Overflow / Server Fault / Super User] clean!

I do things like

    Randomly poke old unanswered questions every hour so they get some attention
    Own community questions and answers so nobody gets unnecessary reputation from them
    Own downvotes on spam/evil posts that get permanently deleted
    Own suggested edits from anonymous users

Take a look at the first point.

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