I've just added this yesterday. It now shows you how close you are to knowing 95% of the words of various movies. I think movies are a good goal, but I want earlier milestones too, so I need to think more. (Maybe spongebob episodes would be good actually)
Ah, that's what it's meant! I thought it was some sort of affiliate Amazon link or an ad, but it wasn't clickable and made little sense given the context.