Blogs are primarily opinion pieces that are not necessarily well researched, are written in a casual style, and contain many links.
Popular articles are intended for the general public and have some level of basic research on the subject being written about.
Articles in subject specific publications and information on websites created by professional associations have a higher level of accuracy than articles, blogs, tweets, and posts written for the general public.
Scholarly articles are written by scholars and researchers for professionals in a specific field, academicians, and other researchers. This is usually the most accurate information on a topic.