A few years ago, science blog posts started decorating themselves with a simple green logo. This logo was meant to credential the blog post as being one about peer-reviewed research, and is supplied by
Research Blogging. As ResearchBlogging.org
explains:
ResearchBlogging.org is a system for identifying the best, most thoughtful blog posts about peer-reviewed research. Since many blogs combine serious posts with more personal or frivolous posts, our site offers away to find only the most carefully-crafted about cutting-edge research, often written by experts in their respective fields.
That's a good goal and one I support. If you read further down, you see that this primarily amounts to the following: if the post is about a peer-reviewed paper, it's admitted to the network. If it's not, it isn't. I guess the assumption is that the latter is not carefully-crafted or about cutting-edge research. And that's where I get off the bus.
Peer Review is Not Magic
One result of the culture wars is that scientists have needed a way of distinguishing real data from fantasy. If you look around the Internet, no doubt half or even more than half of what is written suggests there's no global warming, that vaccines cause autism, etc. Luckily, fanatics rarely publish in peer-reviewed journals, so once we restrict the debate to what is in peer-reviewed journals, pretty much all the evidence suggests global warming, no autism-vaccine link, etc. So pointing to peer-review is a useful rhetorical strategy.
That, at least, is what I assume has motivated all the stink about peer-review in recent years, and ResearchBlogging.org's methods. But it's out of place in the realm of science blogs. It's useful to think about what peer review is.
A reviewer for a paper reads the paper. The reviewer does not (usually) attempt to replicate the experiment. The reviewer does not have access to the data and can't check that the analyses were done correctly. At best, the reviewer evaluates the conclusions the authors draw, and maybe even criticizes the experimental protocol or the statistical analyses used (assuming the reviewers understand statistics, which in my field is certainly not always the case). But the reviewer doesn't can't check that the data weren't made up, that the experimental protocol was actually followed, that there were no errors in data analysis, etc.
In other words, the reviewer can do only and exactly what a good science blogger does. So
good science blogging is, at its essence, a kind of peer review.
Drawbacks
Now, you might worry about the fact that the blogger could be anyone. There's something to that. Of course, ResearchBlogging.org has the same problem. Just because someone is blogging about peer-reviewed paper doesn't mean they understand it (or that they aren't lying about it, which happens surprisingly often with the fluoride fanatics).
So while peer review might be a useful way of vetting the paper, it won't help us vet the
blog. We still have to do that ourselves (and science bloggers seem to do a good job of vetting).
A weakness
Ultimately, I think it's risky to put all our cards on peer review. It's a good system, but its possible to circumvent. We know that some set of scientists read the paper and thought it was worth publishing (with the caveats mentioned above). Of course, those scientists could be anybody, too -- it's up to the editor. So there's nothing really stopping autism-vaccine fanatics from establishing their own peer-reviewed journal, with reviewers who are all themselves autism-vaccine fanatics.
To an extent, that already happens. As long as there's a critical mass of scientists who think a particular way, they can establish their own journal, submit largely to that journal and review each other's submissions. Thus, papers that couldn't have gotten published at a more mainstream journal can get a home. I think anyone who has done a literature search recently knows there are a lot of bad papers out there (in my field, anyway, though I imagine the same is true in others).
Peer review is a helpful vetting process, and it does make papers better. But it doesn't determine fact. That is something we still have to find for ourselves.
****
Observant readers will have noticed that
I use ResearchBlogging.org myself for it's citation system. What can I say? It's useful.