Your point is valid, but the specific instance of obesity is worded poorly. Popular means "liked, admired, or enjoyed by many people or by a particular person or group", and obesity is not popular.

> obesity is not popular

depends on who you ask, really https://en.wikipedia.org/wiki/Fat_acceptance_movement

The existance of a movement still doesn't mean it's popular at large.

good point, hopefully it stays that way

Wait, heroin isn't popular the way FB is. There aren't a billion heroin users (or whatever) on the planet. _For those people who use heroin_ it might be very popular but by far the majority of people are deciding not to use it. Unlike FB.

Because its more difficult to deliver, don't worry, they are trying.

You can argue whatever numbers you want, but the core principle is not assailed, which is that more != better than.

Between the years 1999 and 2010, sales for prescription painkillers to hospitals, doctors and pharmacies increased fourfold. By 2010, the number of pain medications prescribed was enough to keep every single American medicated for one month’s time.[0]

[0]http://www.addictions.com/opiate/10-opiate-addiction-statist...

Heroin and FB seems like a super tough stretch, at least for me.