> A hobbyist with a blog? Probably commercial, if they are using the blog to promote themselves. Or if the blog carries advertising. In that case they are maki

> A hobbyist with a blog? Probably commercial, if they are using the blog to promote themselves. Or if the blog carries advertising. In that case they are making something off carrying the adverts (or why else would they?) and the content is becoming part of the advertisers' (and the people in the middle's) business plan. For some content there is another distinction too: are they using the content or referring to it? Copying a large chunk of an article into their blog (or book or whatever) and quoting part of it (with attribution) are quite different things (the latter usually covered by "fair use" concepts).