Not to put too fine a point on it, if the author's intent is to say that their algorithm intentionally promotes nationalism and xenophobia, I think they missed

Not to put too fine a point on it, if the author's intent is to say that their algorithm intentionally promotes nationalism and xenophobia, I think they missed the headline ;-) I think it's perfectly fair to say that videos from both sides evoked similar passion. We can argue whether it's "good" passion or "bad" passion, but I can't see what difference it makes. Why would I watch a pro-Brexit video for a longer time than an anti-Brexit video, based on topic alone (i.e. assuming that both videos were equally effective in addressing their audience)?