YouTube is currently running a massive visual experiment on its mobile app, and to say it is dividing users would be an understatement. Over the last few days, people started noticing that the text across their main home feeds suddenly looks completely different. Google is quietly testing a new look, swapping out the classic, clean Android system font—Roboto—for one whose look seems to match a much tighter corporate sibling called YouTube Sans Condensed for the app. Currently, this is just an A/B test, meaning only a select group of randomly chosen accounts see it. But the internet already has plenty…