The quickest way to share a link to a model on Sketchfab is to simply copy the URL from the URL bar of your web browser, then paste it where you need to share it.
You can also click the Share button on a model's page, under the viewer.
From the Share link, you can copy the model's short link to share the model page, or click one of the social media icons to authorize sharing directly to Facebook, Twitter, Pinterest, etc.
For embedding in websites and other platforms, see Embedding your 3D models and Embed on Web Platforms.