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Dynamic social media share buttons

Hi All-

I’m wondering if anyone knows how to implement social media share buttons like these:

On that page, each article has unique share buttons, that share the relevant section the page as opposed to the page’s web address. I want to do the same.

I have an endless scroll on a page, and want each CMS item/post on that page to have unique social media share buttons. Does anyone have a sense of what the HTML code is to get that?

Unfortunately I can’t share the page for confidentiality reasons. Thanks!