I think the blog post should rather be named "How to tell journalism from blogging". Simply because you can be a journalist without devoting yourself to journalism (just like you can be a programmer without really doing any good programming).

As one that grew up knowing one of Sweden's most prominent journalists I can vouch for some extremely impressive skills that are needed in order to be a good journalist. It's very much about the amount of schooling and _continuous_ preparation you put into a column: a blogger may become successful merely venting his/her thoughts while a "true" journalist reads a book per hundred written words.