Should one double-flag spam/offensive posts?
I found this new answer to an old question http://stackoverflow.com/q/8268866/626273. Its just promotion for a web development company.
I flagged this as SPAM.
Then I went back and thought, this answer is really only promotion and does not even answer the question partly. Out of curiosity I clicked again on the flag link. I was a bit surprised, but I didn't see any indication that I already flagged this post! So I flagged it again as "Not an Answer".
So my question now, where is the difference between the SPAM Flag and the "Not an answer" flag, is not both for gathering moderator attention (of course stored in different queues)?
Is it OK to use both flags on a single answer or is this just generating more work for the moderators?