operly classified to use as a training set. In our case, we needed to find the gender of a large population of Instagram accounts. We knew that this gender information was readily available on other platforms, in particular Facebook[1] where most users provide their gender publicly. Focusing on Instagram profiles that included links to a facebook URL in their profile (of which there are many) was the way forward.

We built a few simple regular expressions to rule out anything that was not a proper Faceboo