k profile URL and went over all the user ids we ever came across... and went even a little bit further by looking at their followers when relevant. Upon inspection of several hundred million Instagram users (most of the user base at that time), we were able to extract the Instagram username to Facebook profile relationships whenever relevant. The next step was to retrieve gender information on Facebook when available. With 570k profiles, we had our training set.

<strong>Extracting the proper input signals<