Community user is a bot. It automatically bumps old messages that fits the criteria.
Hi, I'm not really a person.
I'm a background process that helps keep this site 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
- Remove abandoned questions
You can check the criteria from the link at top of the post and see this summary by math.se if you want more details.