Chrome extension allows you to highlight any text passage on a web page and to instantly share it, alongside your own notes and comments to Twitter, Facebook, Pinterest, or via email to your preferred contacts. A copy of each of your highlights is also saved on the web and a custom link to it is generated. You can also set highlights to be private or unlisted (this is a paid Pro feature - $2/mo).
Pro version. $2/mo adds ability to select whether highlights saved are public, private or unlisted.
My comment: Reliable tool makes it easy to share on your top social media channels your favorite text passages.