The vast majority of the time I try to be very supportive when giving constructive criticism, but sometimes if the person *repeatedly* posts incorrect things, a harsh wake-up call is warranted IMHO. I did just that a week or so ago on Twitter (maybe the incident to which you're referring Tim?) because the advice was so blatantly misleading from such a widely read blog - it would have had many DBAs struggling to figure out why their system wasn't exhibiting the behavior specified. That's incredibly unhelpful and damaging and needed to be put right immediately, especially as the blog post in question had just been widely RT'd around the community.

I've seen the same thing happen on the MSDN forums with people that constantly reply with dubious or downright misleading information, and I've seen SQL Server Magazine publish un-reviewed articles that speak of regularly shrinking databases - which provoked a wide backlash and a retraction.

Sometimes it can be difficult to figure out what method to take when correcting bad advice, as you especially have to be 100% certain that what you're correcting is, in fact, bad advice.

But good editorial!