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broadly, they are annotations that help some data team within twitter understand how links are being shared, and who shared them you and i could share the same link to “apple.com” and while the path part of the link might be the same, the add ons could differ
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't' is always 22 characters of base64 and changes with every pageload. The 's' is constant even in an incognito window, 2 numerals from what I've seen so far, for me it's 20 for your link. Tracking diffusion of links through hidden graphs is what comes to mind for me.
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The s is a platform indicator (21 is iOS, 19 is Android, just off the top of my head). No idea what the t payload does other than "drop into a hash table somewhere"
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