One of the tasks of the mysterious Community user is to
Randomly poke old unanswered questions every hour so they get some attention
We know the following:
The Community user will bump non-negatively scored questions that have at least one answer scoring 0 and none scoring more than that. The number of unanswered questions bumped per hour depends on the site: 4 per hour on Stack Overflow, 1 per hour on Meta, and 2 per hour on Super User and Server Fault. The default for a new site is 1 per hour.
But I'd like to know some more details about how this works in particular. Since Community himself speaks of "old unanswered questions", is there any age factor/limit involved in the selection process? And is the choice truely random or are there other factors to bias it (like many votes, few views, ...)?
Likewise on Movies & TV there are days when Community seems to bump questions at an hourly basis and then other times feeled weeks of inactivity for Community. Are there factors that prevent the regularly-scheduled bump from happening? (Or is it that we just didn't have any candidates at bump time (though there should be some if it really only goes by the criteria above)?)
It may also be that all this information is deliberately kept undisclosed, but if not, I'd be pleased to gain some more insights into the doings of this user.