[daenney]

There's actually an interesting comment on the article itself:

> Kind of misleading...when you start advertising on Facebook it automatically opts you in to advertising on Instagram.

I don't know if this is true or not but that could certainly explain how their advertiser numbers ballooned like that.

[bobwaycott]

It is true. Every ad, promotion, or boosted post defaults to placement in news feeds on FB desktop and mobile, and Instagram.