How can I mark a question or an answer as spam and where can I find the list of Q/A marked as spam? I had an answer marked as spam, and, if I saw the list, I would probably delete it avoiding the penalty of 100 reputation points.
There isn't a list. Human beans use their judgement to decide when a post is spam. I flag spam when it seems to me that the post is primarily flogging traffic somewhere or pushing a product without either asking or answering a question.