a thoughtful web.
Share good ideas and conversation.   Login or Take a Tour!
b_b  ·  1045 days ago  ·  link  ·    ·  parent  ·  post: Millennials Aren’t Killing Industries. We’re Just Broke and Your Business Sucks

I agree that time three is correct. I don't think you need to resort to em dash in the other two instances; a comma would suffice since what comes after each looks like a modifying clause for the previous statement. Not that I think an em would be incorrect, just that normally when I use them it's to really pause and make an aside. I think the author's intent is just to modify the statement, in which case I would always go comma.