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FWIW one of the internet's first viral shock images was proctological and it was very, uh, wide spread...

So there is an audience, they're just not advertiser friendly.

Nop! That was just a guy who likes putting big things in his ass. He’s called Kirk and he’s active on forums about the subject.

I have seen some foot doctors as well (they do ask permission) - more of a warning to take care of your foot injuries if you are a diabetic like me.

The Long Tail in action

It’s all of them. Dentists, foot doctors, cardiologists, surgeons, etc. And yes, even proctologists.

Sure as hell beats traditional advertising means in this digital age.

proctologist's work has a smaller audience...

They're falling behind.

They're bringing up the rear in the rush to social media.

They wouldn't want to be the butt of jokes.

They can't manually type in URLs, because they're always getting distracted by the colon.

Do experts who are active on social media often comment on things outside of their field of expertise?