Bloggers
If they are bloggers and are not in the business, they are not journalists. I don't care how many faces you put on it, they are not journalists. Professional journalists are trained and then hired to practice that trade.
If some guy (or gal) was out there blogging about physics even though highly knowledgeable, does that make him or her a physicist? You can say they are lay physicists but they are not physicists unless they have the credentials.
Somebody's out there blogging about surgery. You going to let him operate on you?