Was initially surprised about WeChat not being higher just because my understanding was that it was the main social site in China with a lot of the ones popular outside of that country being banned, but I suppose practically nobody outside of China uses it and they are still a minority of the world, big as they are, so on second thought it makes sense. Seeing Pinterest above Twitter genuinely surprises me though, I don't think I've ever seen anyone talking about Pinterest, mentioning their Pinterest account, or linking to it, and tbh I don't actually even know what sort of site it is or what it even looks like.