Yes, it needs to be the first tag like you said or possibly one of the first three or four tags it seems based off my experience. But better safe and sorry and just make it the first tag. I know this as I use the #informationwar tag as the first tag and sometimes as the second, third, etc. But it appears that my one post didn't show up in the trail if I had the tag like at the end. So, I don't how many of the initial tags will show up but maybe a few. Oh, I love LEGO.