Shariff
Shariff enables website users to share their favorite content
...Shariff enables visitors to see how popular your page is on Facebook and share your content with others without needless data leaks. Shariff (/ˈʃɛɹɪf/) is an open-source, low-maintenance, high-privacy solution maintained by German computer magazine c't and heise online. Shariff consists of two parts: a simple JavaScript client library and an optional server-side component. The latter fetches the number of likes or shares. Share buttons and share counts work without a connection between your visitors' browsers and social networks (unless they decide to share, of course).