How Unique Clicks and Link Previews calculated.
Unique Clicks are based on a Browser Cookie we set when redirecting the browser to the link you specify. The Browser Cookie also helps us detect bot traffic, bad traffic and spam attempts.
If a user clicks on a link from two separate devices, this will count as two unique clicks.
A Link Preview is not a click. It instead is an interaction with the link from a Social Media share, or when texting the link some messaging apps will show a preview of the link. We call these Link Previews so they do not inflate your clicks.
Facebook and Twitter cache link previews, do not use this metric to determine how often your link is being shared on Social Media.