Science has authority not because of white coats or titles, but because of precision and transparency: you explain your theory, set out your evidence, and reference the studies that support your case.
Ben GoldacreMost bloggers have no institutional credibility, and so they must build it, by linking transparently, and allowing you to easily double check their work. But more than anything, because linking sources is such an easy thing to do, and the motivations for avoiding links are so dubious, I've detected myself using a new rule of thumb: if you don't link to primary sources, I just don't trust you.
Ben GoldacreReal science is all about critically appraising the evidence for somebody else's position.
Ben Goldacre