Just scrolling through Stack Overflow, and saw this:
I looked in and the author who asked it wasn’t Community. What does this mean? The real asker’s profile picture was gray.
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Community can actually ask a question, but it's rare. Here are some examples:
This is usually the results of a script run by Stack Exchange staff, and won't happen on main sites.
But usually it's something else. As Jdrupal writes, it can bump a question; another possibility is a recent spam answer, where both the post and the account have been deleted. The community user will then 'own' the latest activity on the question as well.