Possible to remove icon from popup?

I was wondering if it’s possible to remove the Facebook icon from the popup asking people to subscribe.

I no longer use Facebook, so I only added the Facebook icon to articles so people can share posts. I’m needing to remove the Facebook icon from the popup, so I can only include social sites in it that I’m active on. But because I added the Facebook share button, it automatically includes it in the popup.

As of now, when someone hovers over the Facebook icon in the popup, they’re given the option to share the article of the page they’re on, but that’s irrelevant to the purpose of the popup.