5

Answering a question marks it as active, but are there any other actions that can do that (i.e. voting, commenting, flagging, reporting, etc)?

6

See this FAQ post on Meta Stack Overflow: What can cause my question to be bumped?

The following will cause a question to be bumped:

  • Addition of an answer
  • Edit or retag of the question, or edit of an answer[...]
  • Addition of a bounty (by anyone)
  • Successful reopening (if the question was closed)
  • The Community user will bump unanswered questions every hour. The number of unanswered questions bumped per hour depends on the site [...]

(The re-open bump is a fairly recent development, or rather an old one that was recently fixed.)

3
  • Bounties don't bump. (or at least, mine didn't a few weeks ago on a months old question, so I edited it.) Apr 23 '12 at 21:28
  • 1
    @LessPop_MoreFizz They do. (Example: this question; last activity date 1 second after a bounty was placed.) Maybe there are some special rules, but I'm not aware of any.
    – a cat
    Apr 23 '12 at 21:39
  • @LessPop_MoreFizz When in doubt, blame caching for things not looking like they've updated.
    – user3389
    Apr 24 '12 at 5:54

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