I suspect given their emphasis on hashtags that was the primary transversal method. When I watched the video my fist thought was "ok but how are their bots det

I suspect given their emphasis on hashtags that was the primary transversal method. When I watched the video my fist thought was "ok but how are their bots determining what kind of video they're watching?" While maybe the best you can do in an automated way, I don't think it's representative of how a real human uses social media. ("I'm feeling depressed, guess I'll check out the depressed hashtag.")