Has anyone ever copied an idea of yours and not given you credit? I know a lot of us post tutorials on our blogs and show others how make an item we share but how do you handle someone doing your tutorial, then posting it in an online shop ( not selling it but displayin their item for sale on it, if that makes sense  )AS WELL as posting the exact same tutorial on their blog with no credit to you whatsoever?

I think it's one of those things you have to just let go and move on but it's not easy when you work so hard on something only to not get credit for it.

What's your thoughts on this?