Active Content Count

Hello, 

I was wondering if someone could give a bit of an explanation as to what counts as an Active Content count. For example if a question is asked and no one answers if but it receives a like, would the system consider that post's activity count to be at 2? Further more what other ways can a piece of content gain an activity count? (Likes, Verified Answers, Ratings, etc...)

Thank you, 

Joe