A wise man, I think it was Woody Allen, said 90% of everything is crud. 99% of everything on the Internet is crud because it lacks the educated filtering of professional peer groups and publishing house editors. Even lunatics like me can create blogs that pontificate on even the most absurd concepts. Just look at how this site is used to spread anti-climate change nonsense. Ideally our schools would teach every child how to discern the wheat from the chaff even though 99% of our teachers have never seen real wheat or chaff.

99% of everything on the Internet is crud because it lacks the educated filtering of professional peer groups...

If you've ever been involved in the peer review process you probably don't have much confidence in the process. The way that personalities, academic rivalries, turf battles, good ole boy networks, tit for tat recommendations or rejections, etc., impact the process makes it just as suspect as anything else you read.

I believe you're thinking of "Sturgeon's Law", after sci-fi author Theodore Sturgeon.