No, older thumbnails are not required to be changed, as stated in the article. There's just too damn many of them for us to effectively or realistically require that!

By the way... I find the sexiest part of a man is his earlobes. I've just got a thing about big lobes. Phwoar! But they can still be shown on thumbnails. So I'm okay! :lol:

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire