There is obviously no consensus on this issue. Perhaps a suggestion....if you post a picture of a quilt, and you don't want it shared, say so. If you are fine with sharing it, say so. If you don't mind but want credit, say so. Seems to be the safest way to make your desire known. I personally don't plan on pinning anyone's quilt based on the discussion, unless I get permission first. I will say however, if you post picture, you have put it out there and take the chance that someone will pin or share it.