Ah, I was looking on the top left of the site… 
Took me a couple of minutes. Do you see it and do you have uBlock?
Yes, I see it and I have Ublock.
Using both Ublock and Facebook container…
The button is visible, but Facebook container is doing it’s work apparantly, and marking it as blocked
I also see the tiny icon in the top left, never bothered me though
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I don’t see that button when I click on “Share” (I see what @keybreak posted above). It’s probably because we use different filter lists in uBlock.
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I don’t have that button at the top left and at the bottom it shows block when pressed.
I don’t use uBlock but do use Privacy Badger and Dan Pollock https://someonewhocares.org/hosts/ipv6/hosts
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Originally fiddled with stuff in uBlock, but I also have these settings in Adblock Plus.
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Strange!
Vivaldi + uBlock here, and no button.
Facebook Container is what blocks it . I installed that add on right now just because I don’t want facebook to track me even though I don’t use it . Just to make sure I don’t click any share buttons to facebook accidentally 
I got that icon too
Just because you are paranoid, it doesn’t mean they are not after you 
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